Merge tag 'iio-for-4.17a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

First round of new devices, features and cleanups for IIO in the 4.17 cycle.

Outside of IIO
* Strongly typed 64bit int_sqrt function needed by the mlx90632

New device support
* adc081s
- New driver supporting adc081s, adc101s and adc121s TI ADCs.
* ad5272
- New driver supproting the ad5272 and ad5274 ADI digital potentiometers
with DT bindings.
* axp20x_adc
- support the AXP813 ADC - includes rework patches to prepare for this.
* mlx90632
- New driver with dt bindings for this IR temperature sensor.

Features
* axp20x_adc
- Add DT bindings and probing.
* dht11
- The sensor has a wider range than advertised in the datasheet - support it.
* st_lsm6dsx
- Add hardware timestamp su9pport.

Cleanups
* ABI docs
- Update email contact for Matt Ranostay
* SPDX changes
- Matt Ranostay has moved his drivers over to SPDX. Currently we are making
this an author choice in IIO.
* ad7192
- Disable burnout current on misconfiguration. No actually effect as
they simply won't work otherwise.
* ad7476
- Drop a license definition that was replicating information in SPDX tag.
* ade7758
- Expand buf_lock to cover both buffer and state protection allowing
unintented uses of mlock in the core to be removed.
* ade7759
- Align parameters to opening parenthesis.
* at91_adc
- Depend on sysfs instead of selecting it - for try wide consistency.
* ccs811
- trivial naming type for a define.
* ep93xx
- Drop a redundant return as a result checking platform_get_resource.
* hts221
- Regmap conversion which simplifies the driver somewhat.
- Clean up some restricted endian cast warnings.
- Drop a trailing whitespace from a comment
- Drop an unnecessary get_unaligned by changing to the right 16bit data type.
* ms5611
- Fix coding style in the probe function (whitespace)
* st_accel
- Use strlcpy instead of strncpy to avoid potentially truncating a string.

Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x

···
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_VOC_short_raw
 Date:		September 2015
 KernelVersion:	4.3
-Contact:	Matt Ranostay <[e-mail]>
+Contact:	Matt Ranostay <[e-mail]>
 Description:
 		Get the raw calibration VOC value from the sensor.
 		This value has little application outside of calibration.

Documentation/ABI/testing/sysfs-bus-iio-proximity-as3935

···
 What		/sys/bus/iio/devices/iio:deviceX/in_proximity_input
 Date:		March 2014
 KernelVersion:	3.15
-Contact:	Matt Ranostay <[e-mail]>
+Contact:	Matt Ranostay <[e-mail]>
 Description:
 		Get the current distance in meters of storm (1km steps)
 		1000-40000 = distance in meters
···
 What		/sys/bus/iio/devices/iio:deviceX/sensor_sensitivity
 Date:		March 2014
 KernelVersion:	3.15
-Contact:	Matt Ranostay <[e-mail]>
+Contact:	Matt Ranostay <[e-mail]>
 Description:
 		Show or set the gain boost of the amp, from 0-31 range.
 		18 = indoors (default)

Documentation/devicetree/bindings/iio/adc/axp20x_adc.txt

···
+* X-Powers AXP ADC bindings
+
+Required properties:
+  - compatible: should be one of:
+    - "x-powers,axp209-adc",
+    - "x-powers,axp221-adc",
+    - "x-powers,axp813-adc",
+  - #io-channel-cells: should be 1,
+
+Example:
+
+&axp22x {
+	adc {
+		compatible = "x-powers,axp221-adc";
+		#io-channel-cells = <1>;
+	};
+};
+
+ADC channels and their indexes per variant:
+
+AXP209
+------
+ 0 | acin_v
+ 1 | acin_i
+ 2 | vbus_v
+ 3 | vbus_i
+ 4 | pmic_temp
+ 5 | gpio0_v
+ 6 | gpio1_v
+ 7 | ipsout_v
+ 8 | batt_v
+ 9 | batt_chrg_i
+10 | batt_dischrg_i
+
+AXP22x
+------
+ 0 | pmic_temp
+ 1 | batt_v
+ 2 | batt_chrg_i
+ 3 | batt_dischrg_i
+
+AXP813
+------
+ 0 | pmic_temp
+ 1 | gpio0_v
+ 2 | batt_v
+ 3 | batt_chrg_i
+ 4 | batt_dischrg_i

Documentation/devicetree/bindings/iio/potentiometer/ad5272.txt

···
+* Analog Devices AD5272 digital potentiometer
+
+The node for this device must be a child node of a I2C controller, hence
+all mandatory properties for your controller must be specified. See directory:
+
+        Documentation/devicetree/bindings/i2c
+
+for more details.
+
+Required properties:
+	- compatible:  	Must be one of the following, depending on the model:
+			adi,ad5272-020
+			adi,ad5272-050
+			adi,ad5272-100
+			adi,ad5274-020
+			adi,ad5274-100
+
+Optional properties:
+ - reset-gpios: GPIO specification for the RESET input. This is an
+		active low signal to the AD5272.
+
+Example:
+ad5272: potentiometer@2f {
+	reg = <0x2F>;
+	compatible = "adi,ad5272-020";
+	reset-gpios = <&gpio3 6 GPIO_ACTIVE_HIGH>;
+};

Documentation/devicetree/bindings/iio/temperature/mlx90632.txt

···
+* Melexis MLX90632 contactless Infra Red temperature sensor
+
+Link to datasheet: https://www.melexis.com/en/documents/documentation/datasheets/datasheet-mlx90632
+
+There are various applications for the Infra Red contactless temperature sensor
+and MLX90632 is most suitable for consumer applications where measured object
+temperature is in range between -20 to 200 degrees Celsius with relative error
+of measurement below 1 degree Celsius in object temperature range for
+industrial applications. Since it can operate and measure ambient temperature
+in range of -20 to 85 degrees Celsius it is suitable also for outdoor use.
+
+Be aware that electronics surrounding the sensor can increase ambient
+temperature. MLX90632 can be calibrated to reduce the housing effect via
+already existing EEPROM parameters.
+
+Since measured object emissivity effects Infra Red energy emitted, emissivity
+should be set before requesting the object temperature.
+
+Required properties:
+  - compatible: should be "melexis,mlx90632"
+  - reg: the I2C address of the sensor (default 0x3a)
+
+Example:
+
+mlx90632@3a {
+	compatible = "melexis,mlx90632";
+	reg = <0x3a>;
+};

MAINTAINERS

···
 S:	Supported
 F:	drivers/iio/temperature/mlx90614.c
 
+MELEXIS MLX90632 DRIVER
+M:	Crt Mori <[e-mail]>
+L:	[e-mail]
+W:	http://www.melexis.com
+S:	Supported
+F:	drivers/iio/temperature/mlx90632.c
+
 MELFAS MIP4 TOUCHSCREEN DRIVER
 M:	Sangwon Jee <[e-mail]>
 W:	http://www.melfas.com

drivers/iio/accel/st_accel_i2c.c

···
 		if ((ret < 0) || (ret >= ST_ACCEL_MAX))
 			return -ENODEV;
 
-		strncpy(client->name, st_accel_id_table[ret].name,
+		strlcpy(client->name, st_accel_id_table[ret].name,
 				sizeof(client->name));
-		client->name[sizeof(client->name) - 1] = '\0';
 	} else if (!id)
 		return -ENODEV;
 

drivers/iio/adc/Kconfig

···
 config AT91_ADC
 	tristate "Atmel AT91 ADC"
 	depends on ARCH_AT91
-	depends on INPUT
+	depends on INPUT && SYSFS
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
-	select SYSFS
 	help
 	  Say yes here to build support for Atmel AT91 ADC.
 

drivers/iio/adc/ad7476.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
- * AD7466/7/8 AD7476/5/7/8 (A) SPI ADC driver
+ * Analog Devices AD7466/7/8 AD7476/5/7/8 (A) SPI ADC driver
+ * TI ADC081S/ADC101S/ADC121S 8/10/12-bit SPI ADC driver
  *
  * Copyright 2010 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
  */
 
 #include <linux/device.h>
···
 	ID_AD7468,
 	ID_AD7495,
 	ID_AD7940,
+	ID_ADC081S,
+	ID_ADC101S,
+	ID_ADC121S,
 };
 
 static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
···
 	},							\
 }
 
+#define ADC081S_CHAN(bits) _AD7476_CHAN((bits), 12 - (bits), \
+		BIT(IIO_CHAN_INFO_RAW))
 #define AD7476_CHAN(bits) _AD7476_CHAN((bits), 13 - (bits), \
 		BIT(IIO_CHAN_INFO_RAW))
 #define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits), \
···
 	},
 	[ID_AD7940] = {
 		.channel[0] = AD7940_CHAN(14),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADC081S] = {
+		.channel[0] = ADC081S_CHAN(8),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADC101S] = {
+		.channel[0] = ADC081S_CHAN(10),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADC121S] = {
+		.channel[0] = ADC081S_CHAN(12),
 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
 	},
 };
···
 	{"ad7910", ID_AD7467},
 	{"ad7920", ID_AD7466},
 	{"ad7940", ID_AD7940},
+	{"adc081s", ID_ADC081S},
+	{"adc101s", ID_ADC101S},
+	{"adc121s", ID_ADC121S},
 	{}
 };
 MODULE_DEVICE_TABLE(spi, ad7476_id);

drivers/iio/adc/axp20x_adc.c

···
 #define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x)	(((x) & BIT(0)) << 1)
 
 #define AXP20X_ADC_RATE_MASK			GENMASK(7, 6)
+#define AXP813_V_I_ADC_RATE_MASK		GENMASK(5, 4)
+#define AXP813_ADC_RATE_MASK			(AXP20X_ADC_RATE_MASK | AXP813_V_I_ADC_RATE_MASK)
 #define AXP20X_ADC_RATE_HZ(x)			((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK)
 #define AXP22X_ADC_RATE_HZ(x)			((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK)
+#define AXP813_TS_GPIO0_ADC_RATE_HZ(x)		AXP20X_ADC_RATE_HZ(x)
+#define AXP813_V_I_ADC_RATE_HZ(x)		((ilog2((x) / 100) << 4) & AXP813_V_I_ADC_RATE_MASK)
+#define AXP813_ADC_RATE_HZ(x)			(AXP20X_ADC_RATE_HZ(x) | AXP813_V_I_ADC_RATE_HZ(x))
 
 #define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg)	\
 	{							\
···
 enum axp22x_adc_channel_i {
 	AXP22X_BATT_CHRG_I = 1,
 	AXP22X_BATT_DISCHRG_I,
+};
+
+enum axp813_adc_channel_v {
+	AXP813_TS_IN = 0,
+	AXP813_GPIO0_V,
+	AXP813_BATT_V,
 };
 
 static struct iio_map axp20x_maps[] = {
···
 			   AXP20X_BATT_DISCHRG_I_H),
 };
 
+static const struct iio_chan_spec axp813_adc_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.address = AXP22X_PMIC_TEMP_H,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OFFSET),
+		.datasheet_name = "pmic_temp",
+	},
+	AXP20X_ADC_CHANNEL(AXP813_GPIO0_V, "gpio0_v", IIO_VOLTAGE,
+			   AXP288_GP_ADC_H),
+	AXP20X_ADC_CHANNEL(AXP813_BATT_V, "batt_v", IIO_VOLTAGE,
+			   AXP20X_BATT_V_H),
+	AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,
+			   AXP20X_BATT_CHRG_I_H),
+	AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,
+			   AXP20X_BATT_DISCHRG_I_H),
+};
+
 static int axp20x_adc_raw(struct iio_dev *indio_dev,
 			  struct iio_chan_spec const *chan, int *val)
 {
···
 	return IIO_VAL_INT;
 }
 
+static int axp813_adc_raw(struct iio_dev *indio_dev,
+			  struct iio_chan_spec const *chan, int *val)
+{
+	struct axp20x_adc_iio *info = iio_priv(indio_dev);
+
+	*val = axp20x_read_variable_width(info->regmap, chan->address, 12);
+	if (*val < 0)
+		return *val;
+
+	return IIO_VAL_INT;
+}
+
 static int axp20x_adc_scale_voltage(int channel, int *val, int *val2)
 {
 	switch (channel) {
···
 	case AXP20X_IPSOUT_V:
 		*val = 1;
 		*val2 = 400000;
+		return IIO_VAL_INT_PLUS_MICRO;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int axp813_adc_scale_voltage(int channel, int *val, int *val2)
+{
+	switch (channel) {
+	case AXP813_GPIO0_V:
+		*val = 0;
+		*val2 = 800000;
+		return IIO_VAL_INT_PLUS_MICRO;
+
+	case AXP813_BATT_V:
+		*val = 1;
+		*val2 = 100000;
 		return IIO_VAL_INT_PLUS_MICRO;
 
 	default:
···
 		*val = 0;
 		*val2 = 500000;
 		return IIO_VAL_INT_PLUS_MICRO;
+
+	case IIO_TEMP:
+		*val = 100;
+		return IIO_VAL_INT;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int axp813_adc_scale(struct iio_chan_spec const *chan, int *val,
+			    int *val2)
+{
+	switch (chan->type) {
+	case IIO_VOLTAGE:
+		return axp813_adc_scale_voltage(chan->channel, val, val2);
+
+	case IIO_CURRENT:
+		*val = 1;
+		return IIO_VAL_INT;
 
 	case IIO_TEMP:
 		*val = 100;
···
 	}
 }
 
+static int axp813_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan, int *val,
+			   int *val2, long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_OFFSET:
+		*val = -2667;
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		return axp813_adc_scale(chan, val, val2);
+
+	case IIO_CHAN_INFO_RAW:
+		return axp813_adc_raw(indio_dev, chan, val);
+
+	default:
+		return -EINVAL;
+	}
+}
+
 static int axp20x_write_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan, int val, int val2,
 			    long mask)
···
 	.read_raw = axp22x_read_raw,
 };
 
-static int axp20x_adc_rate(int rate)
+static const struct iio_info axp813_adc_iio_info = {
+	.read_raw = axp813_read_raw,
+};
+
+static int axp20x_adc_rate(struct axp20x_adc_iio *info, int rate)
 {
-	return AXP20X_ADC_RATE_HZ(rate);
+	return regmap_update_bits(info->regmap, AXP20X_ADC_RATE,
+				  AXP20X_ADC_RATE_MASK,
+				  AXP20X_ADC_RATE_HZ(rate));
 }
 
-static int axp22x_adc_rate(int rate)
+static int axp22x_adc_rate(struct axp20x_adc_iio *info, int rate)
 {
-	return AXP22X_ADC_RATE_HZ(rate);
+	return regmap_update_bits(info->regmap, AXP20X_ADC_RATE,
+				  AXP20X_ADC_RATE_MASK,
+				  AXP22X_ADC_RATE_HZ(rate));
+}
+
+static int axp813_adc_rate(struct axp20x_adc_iio *info, int rate)
+{
+	return regmap_update_bits(info->regmap, AXP813_ADC_RATE,
+				 AXP813_ADC_RATE_MASK,
+				 AXP813_ADC_RATE_HZ(rate));
 }
 
 struct axp_data {
···
 	int				num_channels;
 	struct iio_chan_spec const	*channels;
 	unsigned long			adc_en1_mask;
-	int				(*adc_rate)(int rate);
+	int				(*adc_rate)(struct axp20x_adc_iio *info,
+						    int rate);
 	bool				adc_en2;
 	struct iio_map			*maps;
 };
···
 	.maps = axp22x_maps,
 };
 
+static const struct axp_data axp813_data = {
+	.iio_info = &axp813_adc_iio_info,
+	.num_channels = ARRAY_SIZE(axp813_adc_channels),
+	.channels = axp813_adc_channels,
+	.adc_en1_mask = AXP22X_ADC_EN1_MASK,
+	.adc_rate = axp813_adc_rate,
+	.adc_en2 = false,
+	.maps = axp22x_maps,
+};
+
+static const struct of_device_id axp20x_adc_of_match[] = {
+	{ .compatible = "x-powers,axp209-adc", .data = (void *)&axp20x_data, },
+	{ .compatible = "x-powers,axp221-adc", .data = (void *)&axp22x_data, },
+	{ .compatible = "x-powers,axp813-adc", .data = (void *)&axp813_data, },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, axp20x_adc_of_match);
+
 static const struct platform_device_id axp20x_adc_id_match[] = {
 	{ .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, },
 	{ .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, },
+	{ .name = "axp813-adc", .driver_data = (kernel_ulong_t)&axp813_data, },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match);
···
 	indio_dev->dev.of_node = pdev->dev.of_node;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data;
+	if (!pdev->dev.of_node) {
+		const struct platform_device_id *id;
+
+		id = platform_get_device_id(pdev);
+		info->data = (struct axp_data *)id->driver_data;
+	} else {
+		struct device *dev = &pdev->dev;
+
+		info->data = (struct axp_data *)of_device_get_match_data(dev);
+	}
 
 	indio_dev->name = platform_get_device_id(pdev)->name;
 	indio_dev->info = info->data->iio_info;
···
 				   AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK);
 
 	/* Configure ADCs rate */
-	regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK,
-			   info->data->adc_rate(100));
+	info->data->adc_rate(info, 100);
 
 	ret = iio_map_array_register(indio_dev, info->data->maps);
 	if (ret < 0) {
···
 static struct platform_driver axp20x_adc_driver = {
 	.driver = {
 		.name = "axp20x-adc",
+		.of_match_table = of_match_ptr(axp20x_adc_of_match),
 	},
 	.id_table = axp20x_adc_id_match,
 	.probe = axp20x_probe,

drivers/iio/adc/ep93xx_adc.c

···
 	priv = iio_priv(iiodev);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "Cannot obtain memory resource\n");
-		return -ENXIO;
-	}
 	priv->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(priv->base)) {
 		dev_err(&pdev->dev, "Cannot map memory resource\n");

drivers/iio/adc/ti-adc161s626.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * ti-adc161s626.c - Texas Instruments ADC161S626 1-channel differential ADC
  *
···
  *  adc141s626 - 14-bit ADC
  *  adc161s626 - 16-bit ADC
  *
- * Copyright (C) 2016 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2016-2018
+ * Author: Matt Ranostay <[e-mail]>
  */
 
 #include <linux/module.h>
···
 };
 module_spi_driver(ti_adc_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("Texas Instruments ADC1x1S 1-channel differential ADC");
 MODULE_LICENSE("GPL");

drivers/iio/chemical/ams-iaq-core.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * ams-iaq-core.c - Support for AMS iAQ-Core VOC sensors
  *
- * Copyright (C) 2015 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
+ * Copyright (C) 2015, 2018
+ * Author: Matt Ranostay <[e-mail]>
  */
 
 #include <linux/module.h>
···
 };
 module_i2c_driver(ams_iaqcore_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("AMS iAQ-Core VOC sensors");
 MODULE_LICENSE("GPL v2");

drivers/iio/chemical/atlas-ph-sensor.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * atlas-ph-sensor.c - Support for Atlas Scientific OEM pH-SM sensor
  *
- * Copyright (C) 2015 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2015-2018 Matt Ranostay
+ * Author: Matt Ranostay <[e-mail]>
  */
 
 #include <linux/module.h>
···
 };
 module_i2c_driver(atlas_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("Atlas Scientific pH-SM sensor");
 MODULE_LICENSE("GPL");

drivers/iio/chemical/ccs811.c

···
 #define CCS811_ALG_RESULT_DATA	0x02
 #define CCS811_RAW_DATA		0x03
 #define CCS811_HW_ID		0x20
-#define CCS881_HW_ID_VALUE	0x81
+#define CCS811_HW_ID_VALUE	0x81
 #define CCS811_HW_VERSION	0x21
 #define CCS811_HW_VERSION_VALUE	0x10
 #define CCS811_HW_VERSION_MASK	0xF0
···
 	if (ret < 0)
 		return ret;
 
-	if (ret != CCS881_HW_ID_VALUE) {
+	if (ret != CCS811_HW_ID_VALUE) {
 		dev_err(&client->dev, "hardware id doesn't match CCS81x\n");
 		return -ENODEV;
 	}

drivers/iio/chemical/vz89x.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
  *
- * Copyright (C) 2015 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
+ * Copyright (C) 2015-2018
+ * Author: Matt Ranostay <[e-mail]>
  */
 
 #include <linux/module.h>
···
 };
 module_i2c_driver(vz89x_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
 MODULE_LICENSE("GPL v2");

drivers/iio/health/max30100.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * max30100.c - Support for MAX30100 heart rate and pulse oximeter sensor
  *
- * Copyright (C) 2015 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2015, 2018
+ * Author: Matt Ranostay <[e-mail]>
  *
  * TODO: enable pulse length controls via device tree properties
  */
···
 };
 module_i2c_driver(max30100_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("MAX30100 heart rate and pulse oximeter sensor");
 MODULE_LICENSE("GPL");

drivers/iio/humidity/Kconfig

···
 config HTS221_I2C
 	tristate
 	depends on HTS221
+	select REGMAP_I2C
 
 config HTS221_SPI
 	tristate
 	depends on HTS221
+	select REGMAP_SPI
 
 config HTU21
 	tristate "Measurement Specialties HTU21 humidity & temperature sensor"

drivers/iio/humidity/dht11.c

···
 	}
 
 	dht11->timestamp = ktime_get_boot_ns();
-	if (hum_int < 20) {  /* DHT22 */
+	if (hum_int < 4) {  /* DHT22: 100000 = (3*256+232)*100 */
 		dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) *
 					((temp_int & 0x80) ? -100 : 100);
 		dht11->humidity = ((hum_int << 8) + hum_dec) * 100;

drivers/iio/humidity/hdc100x.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
  *
- * Copyright (C) 2015 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2015, 2018
+ * Author: Matt Ranostay <[e-mail]>
  *
  * Datasheets:
  * http://www.ti.com/product/HDC1000/datasheet
···
 };
 module_i2c_driver(hdc100x_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
 MODULE_LICENSE("GPL");

drivers/iio/humidity/hts221.h

···
 
 #include <linux/iio/iio.h>
 
-#define HTS221_RX_MAX_LENGTH	8
-#define HTS221_TX_MAX_LENGTH	8
-
 #define HTS221_DATA_SIZE	2
-
-struct hts221_transfer_buffer {
-	u8 rx_buf[HTS221_RX_MAX_LENGTH];
-	u8 tx_buf[HTS221_TX_MAX_LENGTH] ____cacheline_aligned;
-};
-
-struct hts221_transfer_function {
-	int (*read)(struct device *dev, u8 addr, int len, u8 *data);
-	int (*write)(struct device *dev, u8 addr, int len, u8 *data);
-};
 
 enum hts221_sensor_type {
 	HTS221_SENSOR_H,
···
 struct hts221_hw {
 	const char *name;
 	struct device *dev;
+	struct regmap *regmap;
 
-	struct mutex lock;
 	struct iio_trigger *trig;
 	int irq;
 
···
 
 	bool enabled;
 	u8 odr;
-
-	const struct hts221_transfer_function *tf;
-	struct hts221_transfer_buffer tb;
 };
 
 extern const struct dev_pm_ops hts221_pm_ops;
 
-int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask, u8 val);
 int hts221_probe(struct device *dev, int irq, const char *name,
-		 const struct hts221_transfer_function *tf_ops);
+		 struct regmap *regmap);
 int hts221_set_enable(struct hts221_hw *hw, bool enable);
 int hts221_allocate_buffers(struct hts221_hw *hw);
 int hts221_allocate_trigger(struct hts221_hw *hw);

drivers/iio/humidity/hts221_buffer.c

···
 #include <linux/device.h>
 #include <linux/interrupt.h>
 #include <linux/irqreturn.h>
+#include <linux/regmap.h>
+#include <linux/bitfield.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/trigger.h>
···
 {
 	struct iio_dev *iio_dev = iio_trigger_get_drvdata(trig);
 	struct hts221_hw *hw = iio_priv(iio_dev);
-	int err;
 
-	err = hts221_write_with_mask(hw, HTS221_REG_DRDY_EN_ADDR,
-				     HTS221_REG_DRDY_EN_MASK, state);
-
-	return err < 0 ? err : 0;
+	return regmap_update_bits(hw->regmap, HTS221_REG_DRDY_EN_ADDR,
+				  HTS221_REG_DRDY_EN_MASK,
+				  FIELD_PREP(HTS221_REG_DRDY_EN_MASK, state));
 }
 
 static const struct iio_trigger_ops hts221_trigger_ops = {
···
 static irqreturn_t hts221_trigger_handler_thread(int irq, void *private)
 {
 	struct hts221_hw *hw = private;
-	u8 status;
-	int err;
+	int err, status;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_STATUS_ADDR, sizeof(status),
-			   &status);
+	err = regmap_read(hw->regmap, HTS221_REG_STATUS_ADDR, &status);
 	if (err < 0)
 		return IRQ_HANDLED;
 
-	/* 
+	/*
 	 * H_DA bit (humidity data available) is routed to DRDY line.
 	 * Humidity sample is computed after temperature one.
 	 * Here we can assume data channels are both available if H_DA bit
···
 		break;
 	}
 
-	err = hts221_write_with_mask(hw, HTS221_REG_DRDY_HL_ADDR,
-				     HTS221_REG_DRDY_HL_MASK, irq_active_low);
+	err = regmap_update_bits(hw->regmap, HTS221_REG_DRDY_HL_ADDR,
+				 HTS221_REG_DRDY_HL_MASK,
+				 FIELD_PREP(HTS221_REG_DRDY_HL_MASK,
+					    irq_active_low));
 	if (err < 0)
 		return err;
 
···
 		open_drain = true;
 	}
 
-	err = hts221_write_with_mask(hw, HTS221_REG_DRDY_PP_OD_ADDR,
-				     HTS221_REG_DRDY_PP_OD_MASK,
-				     open_drain);
+	err = regmap_update_bits(hw->regmap, HTS221_REG_DRDY_PP_OD_ADDR,
+				 HTS221_REG_DRDY_PP_OD_MASK,
+				 FIELD_PREP(HTS221_REG_DRDY_PP_OD_MASK,
+					    open_drain));
 	if (err < 0)
 		return err;
 
···
 
 	/* humidity data */
 	ch = &iio_dev->channels[HTS221_SENSOR_H];
-	err = hw->tf->read(hw->dev, ch->address, HTS221_DATA_SIZE,
-			   buffer);
+	err = regmap_bulk_read(hw->regmap, ch->address,
+			       buffer, HTS221_DATA_SIZE);
 	if (err < 0)
 		goto out;
 
 	/* temperature data */
 	ch = &iio_dev->channels[HTS221_SENSOR_T];
-	err = hw->tf->read(hw->dev, ch->address, HTS221_DATA_SIZE,
-			   buffer + HTS221_DATA_SIZE);
+	err = regmap_bulk_read(hw->regmap, ch->address,
+			       buffer + HTS221_DATA_SIZE, HTS221_DATA_SIZE);
 	if (err < 0)
 		goto out;
 

drivers/iio/humidity/hts221_core.c

···
 #include <linux/iio/sysfs.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
-#include <asm/unaligned.h>
+#include <linux/regmap.h>
+#include <linux/bitfield.h>
 
 #include "hts221.h"
 
···
 	IIO_CHAN_SOFT_TIMESTAMP(2),
 };
 
-int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask, u8 val)
-{
-	u8 data;
-	int err;
-
-	mutex_lock(&hw->lock);
-
-	err = hw->tf->read(hw->dev, addr, sizeof(data), &data);
-	if (err < 0) {
-		dev_err(hw->dev, "failed to read %02x register\n", addr);
-		goto unlock;
-	}
-
-	data = (data & ~mask) | ((val << __ffs(mask)) & mask);
-
-	err = hw->tf->write(hw->dev, addr, sizeof(data), &data);
-	if (err < 0)
-		dev_err(hw->dev, "failed to write %02x register\n", addr);
-
-unlock:
-	mutex_unlock(&hw->lock);
-
-	return err;
-}
-
 static int hts221_check_whoami(struct hts221_hw *hw)
 {
-	u8 data;
-	int err;
+	int err, data;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_WHOAMI_ADDR, sizeof(data),
-			   &data);
+	err = regmap_read(hw->regmap, HTS221_REG_WHOAMI_ADDR, &data);
 	if (err < 0) {
 		dev_err(hw->dev, "failed to read whoami register\n");
 		return err;
···
 	if (i == ARRAY_SIZE(hts221_odr_table))
 		return -EINVAL;
 
-	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
-				     HTS221_ODR_MASK, hts221_odr_table[i].val);
+	err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
+				 HTS221_ODR_MASK,
+				 FIELD_PREP(HTS221_ODR_MASK,
+					    hts221_odr_table[i].val));
 	if (err < 0)
 		return err;
 
···
 			     enum hts221_sensor_type type,
 			     u16 val)
 {
-	int i, err;
 	const struct hts221_avg *avg = &hts221_avg_list[type];
+	int i, err, data;
 
 	for (i = 0; i < HTS221_AVG_DEPTH; i++)
 		if (avg->avg_avl[i] == val)
···
 	if (i == HTS221_AVG_DEPTH)
 		return -EINVAL;
 
-	err = hts221_write_with_mask(hw, avg->addr, avg->mask, i);
+	data = ((i << __ffs(avg->mask)) & avg->mask);
+	err = regmap_update_bits(hw->regmap, avg->addr,
+				 avg->mask, data);
 	if (err < 0)
 		return err;
 
···
 {
 	int err;
 
-	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
-				     HTS221_ENABLE_MASK, enable);
+	err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
+				 HTS221_ENABLE_MASK,
+				 FIELD_PREP(HTS221_ENABLE_MASK, enable));
 	if (err < 0)
 		return err;
 
···
 
 static int hts221_parse_temp_caldata(struct hts221_hw *hw)
 {
-	int err, *slope, *b_gen;
+	int err, *slope, *b_gen, cal0, cal1;
 	s16 cal_x0, cal_x1, cal_y0, cal_y1;
-	u8 cal0, cal1;
+	__le16 val;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_0T_CAL_Y_H,
-			   sizeof(cal0), &cal0);
+	err = regmap_read(hw->regmap, HTS221_REG_0T_CAL_Y_H, &cal0);
 	if (err < 0)
 		return err;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_T1_T0_CAL_Y_H,
-			   sizeof(cal1), &cal1);
+	err = regmap_read(hw->regmap, HTS221_REG_T1_T0_CAL_Y_H, &cal1);
 	if (err < 0)
 		return err;
-	cal_y0 = (le16_to_cpu(cal1 & 0x3) << 8) | cal0;
+	cal_y0 = ((cal1 & 0x3) << 8) | cal0;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_1T_CAL_Y_H,
-			   sizeof(cal0), &cal0);
+	err = regmap_read(hw->regmap, HTS221_REG_1T_CAL_Y_H, &cal0);
 	if (err < 0)
 		return err;
 	cal_y1 = (((cal1 & 0xc) >> 2) << 8) | cal0;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_0T_CAL_X_L, sizeof(cal_x0),
-			   (u8 *)&cal_x0);
+	err = regmap_bulk_read(hw->regmap, HTS221_REG_0T_CAL_X_L,
+			       &val, sizeof(val));
 	if (err < 0)
 		return err;
-	cal_x0 = le16_to_cpu(cal_x0);
+	cal_x0 = le16_to_cpu(val);
 
-	err = hw->tf->read(hw->dev, HTS221_REG_1T_CAL_X_L, sizeof(cal_x1),
-			   (u8 *)&cal_x1);
+	err = regmap_bulk_read(hw->regmap, HTS221_REG_1T_CAL_X_L,
+			       &val, sizeof(val));
 	if (err < 0)
 		return err;
-	cal_x1 = le16_to_cpu(cal_x1);
+	cal_x1 = le16_to_cpu(val);
 
 	slope = &hw->sensors[HTS221_SENSOR_T].slope;
 	b_gen = &hw->sensors[HTS221_SENSOR_T].b_gen;
···
 
 static int hts221_parse_rh_caldata(struct hts221_hw *hw)
 {
-	int err, *slope, *b_gen;
+	int err, *slope, *b_gen, data;
 	s16 cal_x0, cal_x1, cal_y0, cal_y1;
-	u8 data;
+	__le16 val;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_0RH_CAL_Y_H, sizeof(data),
-			   &data);
+	err = regmap_read(hw->regmap, HTS221_REG_0RH_CAL_Y_H, &data);
 	if (err < 0)
 		return err;
 	cal_y0 = data;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_1RH_CAL_Y_H, sizeof(data),
-			   &data);
+	err = regmap_read(hw->regmap, HTS221_REG_1RH_CAL_Y_H, &data);
 	if (err < 0)
 		return err;
 	cal_y1 = data;
 
-	err = hw->tf->read(hw->dev, HTS221_REG_0RH_CAL_X_H, sizeof(cal_x0),
-			   (u8 *)&cal_x0);
+	err = regmap_bulk_read(hw->regmap, HTS221_REG_0RH_CAL_X_H,
+			       &val, sizeof(val));
 	if (err < 0)
 		return err;
-	cal_x0 = le16_to_cpu(cal_x0);
+	cal_x0 = le16_to_cpu(val);
 
-	err = hw->tf->read(hw->dev, HTS221_REG_1RH_CAL_X_H, sizeof(cal_x1),
-			   (u8 *)&cal_x1);
+	err = regmap_bulk_read(hw->regmap, HTS221_REG_1RH_CAL_X_H,
+			       &val, sizeof(val));
 	if (err < 0)
 		return err;
-	cal_x1 = le16_to_cpu(cal_x1);
+	cal_x1 = le16_to_cpu(val);
 
 	slope = &hw->sensors[HTS221_SENSOR_H].slope;
 	b_gen = &hw->sensors[HTS221_SENSOR_H].b_gen;
···
 
 static int hts221_read_oneshot(struct hts221_hw *hw, u8 addr, int *val)
 {
-	u8 data[HTS221_DATA_SIZE];
+	__le16 data;
 	int err;
 
 	err = hts221_set_enable(hw, true);
···
 
 	msleep(50);
 
-	err = hw->tf->read(hw->dev, addr, sizeof(data), data);
+	err = regmap_bulk_read(hw->regmap, addr, &data, sizeof(data));
 	if (err < 0)
 		return err;
 
 	hts221_set_enable(hw, false);
 
-	*val = (s16)get_unaligned_le16(data);
+	*val = (s16)le16_to_cpu(data);
 
 	return IIO_VAL_INT;
 }
···
 static const unsigned long hts221_scan_masks[] = {0x3, 0x0};
 
 int hts221_probe(struct device *dev, int irq, const char *name,
-		 const struct hts221_transfer_function *tf_ops)
+		 struct regmap *regmap)
 {
 	struct iio_dev *iio_dev;
 	struct hts221_hw *hw;
···
 	hw->name = name;
 	hw->dev = dev;
 	hw->irq = irq;
-	hw->tf = tf_ops;
-
-	mutex_init(&hw->lock);
+	hw->regmap = regmap;
 
 	err = hts221_check_whoami(hw);
 	if (err < 0)
···
 	iio_dev->info = &hts221_info;
 
 	/* enable Block Data Update */
-	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
-				     HTS221_BDU_MASK, 1);
+	err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
+				 HTS221_BDU_MASK,
+				 FIELD_PREP(HTS221_BDU_MASK, 1));
 	if (err < 0)
 		return err;
 
···
 {
 	struct iio_dev *iio_dev = dev_get_drvdata(dev);
 	struct hts221_hw *hw = iio_priv(iio_dev);
-	int err;
 
-	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
-				     HTS221_ENABLE_MASK, false);
-
-	return err < 0 ? err : 0;
+	return regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
+				  HTS221_ENABLE_MASK,
+				  FIELD_PREP(HTS221_ENABLE_MASK, false));
 }
 
 static int __maybe_unused hts221_resume(struct device *dev)
···
 	int err = 0;
 
 	if (hw->enabled)
-		err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
-					     HTS221_ENABLE_MASK, true);
-
+		err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
+					 HTS221_ENABLE_MASK,
+					 FIELD_PREP(HTS221_ENABLE_MASK,
+						    true));
 	return err;
 }
 

drivers/iio/humidity/hts221_i2c.c

···
 #include <linux/acpi.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+#include <linux/regmap.h>
+
 #include "hts221.h"
 
-#define I2C_AUTO_INCREMENT	0x80
+#define HTS221_I2C_AUTO_INCREMENT	BIT(7)
 
-static int hts221_i2c_read(struct device *dev, u8 addr, int len, u8 *data)
-{
-	struct i2c_msg msg[2];
-	struct i2c_client *client = to_i2c_client(dev);
-
-	if (len > 1)
-		addr |= I2C_AUTO_INCREMENT;
-
-	msg[0].addr = client->addr;
-	msg[0].flags = client->flags;
-	msg[0].len = 1;
-	msg[0].buf = &addr;
-
-	msg[1].addr = client->addr;
-	msg[1].flags = client->flags | I2C_M_RD;
-	msg[1].len = len;
-	msg[1].buf = data;
-
-	return i2c_transfer(client->adapter, msg, 2);
-}
-
-static int hts221_i2c_write(struct device *dev, u8 addr, int len, u8 *data)
-{
-	u8 send[len + 1];
-	struct i2c_msg msg;
-	struct i2c_client *client = to_i2c_client(dev);
-
-	if (len > 1)
-		addr |= I2C_AUTO_INCREMENT;
-
-	send[0] = addr;
-	memcpy(&send[1], data, len * sizeof(u8));
-
-	msg.addr = client->addr;
-	msg.flags = client->flags;
-	msg.len = len + 1;
-	msg.buf = send;
-
-	return i2c_transfer(client->adapter, &msg, 1);
-}
-
-static const struct hts221_transfer_function hts221_transfer_fn = {
-	.read = hts221_i2c_read,
-	.write = hts221_i2c_write,
+static const struct regmap_config hts221_i2c_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.write_flag_mask = HTS221_I2C_AUTO_INCREMENT,
+	.read_flag_mask = HTS221_I2C_AUTO_INCREMENT,
 };
 
 static int hts221_i2c_probe(struct i2c_client *client,
 			    const struct i2c_device_id *id)
 {
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_i2c(client, &hts221_i2c_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Failed to register i2c regmap %d\n",
+			(int)PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
 	return hts221_probe(&client->dev, client->irq,
-			    client->name, &hts221_transfer_fn);
+			    client->name, regmap);
 }
 
 static const struct acpi_device_id hts221_acpi_match[] = {

drivers/iio/humidity/hts221_spi.c

···
 #include <linux/module.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
+#include <linux/regmap.h>
+
 #include "hts221.h"
 
-#define SENSORS_SPI_READ	0x80
-#define SPI_AUTO_INCREMENT	0x40
+#define HTS221_SPI_READ			BIT(7)
+#define HTS221_SPI_AUTO_INCREMENT	BIT(6)
 
-static int hts221_spi_read(struct device *dev, u8 addr, int len, u8 *data)
-{
-	int err;
-	struct spi_device *spi = to_spi_device(dev);
-	struct iio_dev *iio_dev = spi_get_drvdata(spi);
-	struct hts221_hw *hw = iio_priv(iio_dev);
-
-	struct spi_transfer xfers[] = {
-		{
-			.tx_buf = hw->tb.tx_buf,
-			.bits_per_word = 8,
-			.len = 1,
-		},
-		{
-			.rx_buf = hw->tb.rx_buf,
-			.bits_per_word = 8,
-			.len = len,
-		}
-	};
-
-	if (len > 1)
-		addr |= SPI_AUTO_INCREMENT;
-	hw->tb.tx_buf[0] = addr | SENSORS_SPI_READ;
-
-	err = spi_sync_transfer(spi, xfers,  ARRAY_SIZE(xfers));
-	if (err < 0)
-		return err;
-
-	memcpy(data, hw->tb.rx_buf, len * sizeof(u8));
-
-	return len;
-}
-
-static int hts221_spi_write(struct device *dev, u8 addr, int len, u8 *data)
-{
-	struct spi_device *spi = to_spi_device(dev);
-	struct iio_dev *iio_dev = spi_get_drvdata(spi);
-	struct hts221_hw *hw = iio_priv(iio_dev);
-
-	struct spi_transfer xfers = {
-		.tx_buf = hw->tb.tx_buf,
-		.bits_per_word = 8,
-		.len = len + 1,
-	};
-
-	if (len >= HTS221_TX_MAX_LENGTH)
-		return -ENOMEM;
-
-	if (len > 1)
-		addr |= SPI_AUTO_INCREMENT;
-	hw->tb.tx_buf[0] = addr;
-	memcpy(&hw->tb.tx_buf[1], data, len);
-
-	return spi_sync_transfer(spi, &xfers, 1);
-}
-
-static const struct hts221_transfer_function hts221_transfer_fn = {
-	.read = hts221_spi_read,
-	.write = hts221_spi_write,
+static const struct regmap_config hts221_spi_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.write_flag_mask = HTS221_SPI_AUTO_INCREMENT,
+	.read_flag_mask = HTS221_SPI_READ | HTS221_SPI_AUTO_INCREMENT,
 };
 
 static int hts221_spi_probe(struct spi_device *spi)
 {
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_spi(spi, &hts221_spi_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "Failed to register spi regmap %d\n",
+			(int)PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
 	return hts221_probe(&spi->dev, spi->irq,
-			    spi->modalias, &hts221_transfer_fn);
+			    spi->modalias, regmap);
 }
 
 static const struct of_device_id hts221_spi_of_match[] = {

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h

···
 	ST_LSM6DSX_MAX_ID,
 };
 
-#define ST_LSM6DSX_BUFF_SIZE		256
+#define ST_LSM6DSX_BUFF_SIZE		400
 #define ST_LSM6DSX_CHAN_SIZE		2
 #define ST_LSM6DSX_SAMPLE_SIZE		6
 #define ST_LSM6DSX_MAX_WORD_LEN		((32 / ST_LSM6DSX_SAMPLE_SIZE) * \
···
 };
 
 /**
+ * struct st_lsm6dsx_hw_ts_settings - ST IMU hw timer settings
+ * @timer_en: Hw timer enable register info (addr + mask).
+ * @hr_timer: Hw timer resolution register info (addr + mask).
+ * @fifo_en: Hw timer FIFO enable register info (addr + mask).
+ * @decimator: Hw timer FIFO decimator register info (addr + mask).
+ */
+struct st_lsm6dsx_hw_ts_settings {
+	struct st_lsm6dsx_reg timer_en;
+	struct st_lsm6dsx_reg hr_timer;
+	struct st_lsm6dsx_reg fifo_en;
+	struct st_lsm6dsx_reg decimator;
+};
+
+/**
  * struct st_lsm6dsx_settings - ST IMU sensor settings
  * @wai: Sensor WhoAmI default value.
  * @max_fifo_size: Sensor max fifo length in FIFO words.
  * @id: List of hw id supported by the driver configuration.
  * @decimator: List of decimator register info (addr + mask).
  * @fifo_ops: Sensor hw FIFO parameters.
+ * @ts_settings: Hw timer related settings.
  */
 struct st_lsm6dsx_settings {
 	u8 wai;
···
 	enum st_lsm6dsx_hw_id id[ST_LSM6DSX_MAX_ID];
 	struct st_lsm6dsx_reg decimator[ST_LSM6DSX_MAX_ID];
 	struct st_lsm6dsx_fifo_ops fifo_ops;
+	struct st_lsm6dsx_hw_ts_settings ts_settings;
 };
 
 enum st_lsm6dsx_sensor_id {
···
  * @watermark: Sensor watermark level.
  * @sip: Number of samples in a given pattern.
  * @decimator: FIFO decimation factor.
- * @delta_ts: Delta time between two consecutive interrupts.
- * @ts: Latest timestamp from the interrupt handler.
+ * @ts_ref: Sensor timestamp reference for hw one.
  */
 struct st_lsm6dsx_sensor {
 	char name[32];
···
 	u16 watermark;
 	u8 sip;
 	u8 decimator;
-
-	s64 delta_ts;
-	s64 ts;
+	s64 ts_ref;
 };
 
 /**
···
  * @conf_lock: Mutex to prevent concurrent FIFO configuration update.
  * @fifo_mode: FIFO operating mode supported by the device.
  * @enable_mask: Enabled sensor bitmask.
- * @sip: Total number of samples (acc/gyro) in a given pattern.
+ * @ts_sip: Total number of timestamp samples in a given pattern.
+ * @sip: Total number of samples (acc/gyro/ts) in a given pattern.
  * @buff: Device read buffer.
  * @iio_devs: Pointers to acc/gyro iio_dev instances.
  * @settings: Pointer to the specific sensor settings in use.
···
 
 	enum st_lsm6dsx_fifo_mode fifo_mode;
 	u8 enable_mask;
+	u8 ts_sip;
 	u8 sip;
 
 	u8 *buff;

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c

···
 #define ST_LSM6DSX_FIFO_ODR_MASK		GENMASK(6, 3)
 #define ST_LSM6DSX_FIFO_EMPTY_MASK		BIT(12)
 #define ST_LSM6DSX_REG_FIFO_OUTL_ADDR		0x3e
+#define ST_LSM6DSX_REG_TS_RESET_ADDR		0x42
 
 #define ST_LSM6DSX_MAX_FIFO_ODR_VAL		0x08
+
+#define ST_LSM6DSX_TS_SENSITIVITY		25000UL /* 25us */
+#define ST_LSM6DSX_TS_RESET_VAL			0xaa
 
 struct st_lsm6dsx_decimator_entry {
 	u8 decimator;
···
 
 static int st_lsm6dsx_update_decimators(struct st_lsm6dsx_hw *hw)
 {
+	u16 max_odr, min_odr, sip = 0, ts_sip = 0;
+	const struct st_lsm6dsx_reg *ts_dec_reg;
 	struct st_lsm6dsx_sensor *sensor;
-	u16 max_odr, min_odr, sip = 0;
-	int err, i;
+	int err = 0, i;
 	u8 data;
 
 	st_lsm6dsx_get_max_min_odr(hw, &max_odr, &min_odr);
···
 			sensor->decimator = 0;
 			data = 0;
 		}
+		ts_sip = max_t(u16, ts_sip, sensor->sip);
 
 		dec_reg = &hw->settings->decimator[sensor->id];
 		if (dec_reg->addr) {
···
 		}
 		sip += sensor->sip;
 	}
-	hw->sip = sip;
+	hw->sip = sip + ts_sip;
+	hw->ts_sip = ts_sip;
 
-	return 0;
+	/*
+	 * update hw ts decimator if necessary. Decimator for hw timestamp
+	 * is always 1 or 0 in order to have a ts sample for each data
+	 * sample in FIFO
+	 */
+	ts_dec_reg = &hw->settings->ts_settings.decimator;
+	if (ts_dec_reg->addr) {
+		int val, ts_dec = !!hw->ts_sip;
+
+		val = ST_LSM6DSX_SHIFT_VAL(ts_dec, ts_dec_reg->mask);
+		err = regmap_update_bits(hw->regmap, ts_dec_reg->addr,
+					 ts_dec_reg->mask, val);
+	}
+	return err;
 }
 
 int st_lsm6dsx_set_fifo_mode(struct st_lsm6dsx_hw *hw,
···
 				 &wdata, sizeof(wdata));
 }
 
+static int st_lsm6dsx_reset_hw_ts(struct st_lsm6dsx_hw *hw)
+{
+	struct st_lsm6dsx_sensor *sensor;
+	int i, err;
+
+	/* reset hw ts counter */
+	err = regmap_write(hw->regmap, ST_LSM6DSX_REG_TS_RESET_ADDR,
+			   ST_LSM6DSX_TS_RESET_VAL);
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) {
+		sensor = iio_priv(hw->iio_devs[i]);
+		/*
+		 * store enable buffer timestamp as reference for
+		 * hw timestamp
+		 */
+		sensor->ts_ref = iio_get_time_ns(hw->iio_devs[i]);
+	}
+	return 0;
+}
+
 /*
  * Set max bulk read to ST_LSM6DSX_MAX_WORD_LEN in order to avoid
  * a kmalloc for each bus access
···
 	return 0;
 }
 
+#define ST_LSM6DSX_IIO_BUFF_SIZE	(ALIGN(ST_LSM6DSX_SAMPLE_SIZE, \
+					       sizeof(s64)) + sizeof(s64))
 /**
  * st_lsm6dsx_read_fifo() - LSM6DS3-LSM6DS3H-LSM6DSL-LSM6DSM read FIFO routine
  * @hw: Pointer to instance of struct st_lsm6dsx_hw.
···
 {
 	u16 fifo_len, pattern_len = hw->sip * ST_LSM6DSX_SAMPLE_SIZE;
 	u16 fifo_diff_mask = hw->settings->fifo_ops.fifo_diff.mask;
-	int err, acc_sip, gyro_sip, read_len, samples, offset;
+	int err, acc_sip, gyro_sip, ts_sip, read_len, offset;
 	struct st_lsm6dsx_sensor *acc_sensor, *gyro_sensor;
-	s64 acc_ts, acc_delta_ts, gyro_ts, gyro_delta_ts;
-	u8 iio_buff[ALIGN(ST_LSM6DSX_SAMPLE_SIZE, sizeof(s64)) + sizeof(s64)];
+	u8 gyro_buff[ST_LSM6DSX_IIO_BUFF_SIZE];
+	u8 acc_buff[ST_LSM6DSX_IIO_BUFF_SIZE];
+	bool reset_ts = false;
 	__le16 fifo_status;
+	s64 ts = 0;
 
 	err = regmap_bulk_read(hw->regmap,
 			       hw->settings->fifo_ops.fifo_diff.addr,
···
 
 	fifo_len = (le16_to_cpu(fifo_status) & fifo_diff_mask) *
 		   ST_LSM6DSX_CHAN_SIZE;
-	samples = fifo_len / ST_LSM6DSX_SAMPLE_SIZE;
 	fifo_len = (fifo_len / pattern_len) * pattern_len;
 
-	/*
-	 * compute delta timestamp between two consecutive samples
-	 * in order to estimate queueing time of data generated
-	 * by the sensor
-	 */
 	acc_sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
-	acc_ts = acc_sensor->ts - acc_sensor->delta_ts;
-	acc_delta_ts = div_s64(acc_sensor->delta_ts * acc_sensor->decimator,
-			       samples);
-
 	gyro_sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_GYRO]);
-	gyro_ts = gyro_sensor->ts - gyro_sensor->delta_ts;
-	gyro_delta_ts = div_s64(gyro_sensor->delta_ts * gyro_sensor->decimator,
-				samples);
 
 	for (read_len = 0; read_len < fifo_len; read_len += pattern_len) {
 		err = st_lsm6dsx_read_block(hw, hw->buff, pattern_len);
···
 		 * Data are written to the FIFO with a specific pattern
 		 * depending on the configured ODRs. The first sequence of data
 		 * stored in FIFO contains the data of all enabled sensors
-		 * (e.g. Gx, Gy, Gz, Ax, Ay, Az), then data are repeated
+		 * (e.g. Gx, Gy, Gz, Ax, Ay, Az, Ts), then data are repeated
 		 * depending on the value of the decimation factor set for each
 		 * sensor.
 		 *
···
 		 *   - gyroscope ODR = 208Hz, accelerometer ODR = 104Hz
 		 * Since the gyroscope ODR is twice the accelerometer one, the
 		 * following pattern is repeated every 9 samples:
-		 *   - Gx, Gy, Gz, Ax, Ay, Az, Gx, Gy, Gz
+		 *   - Gx, Gy, Gz, Ax, Ay, Az, Ts, Gx, Gy, Gz, Ts, Gx, ..
 		 */
 		gyro_sip = gyro_sensor->sip;
 		acc_sip = acc_sensor->sip;
+		ts_sip = hw->ts_sip;
 		offset = 0;
 
 		while (acc_sip > 0 || gyro_sip > 0) {
-			if (gyro_sip-- > 0) {
-				memcpy(iio_buff, &hw->buff[offset],
+			if (gyro_sip > 0) {
+				memcpy(gyro_buff, &hw->buff[offset],
 				       ST_LSM6DSX_SAMPLE_SIZE);
-				iio_push_to_buffers_with_timestamp(
-					hw->iio_devs[ST_LSM6DSX_ID_GYRO],
-					iio_buff, gyro_ts);
 				offset += ST_LSM6DSX_SAMPLE_SIZE;
-				gyro_ts += gyro_delta_ts;
+			}
+			if (acc_sip > 0) {
+				memcpy(acc_buff, &hw->buff[offset],
+				       ST_LSM6DSX_SAMPLE_SIZE);
+				offset += ST_LSM6DSX_SAMPLE_SIZE;
 			}
 
-			if (acc_sip-- > 0) {
-				memcpy(iio_buff, &hw->buff[offset],
-				       ST_LSM6DSX_SAMPLE_SIZE);
+			if (ts_sip-- > 0) {
+				u8 data[ST_LSM6DSX_SAMPLE_SIZE];
+
+				memcpy(data, &hw->buff[offset], sizeof(data));
+				/*
+				 * hw timestamp is 3B long and it is stored
+				 * in FIFO using 6B as 4th FIFO data set
+				 * according to this schema:
+				 * B0 = ts[15:8], B1 = ts[23:16], B3 = ts[7:0]
+				 */
+				ts = data[1] << 16 | data[0] << 8 | data[3];
+				/*
+				 * check if hw timestamp engine is going to
+				 * reset (the sensor generates an interrupt
+				 * to signal the hw timestamp will reset in
+				 * 1.638s)
+				 */
+				if (!reset_ts && ts >= 0xff0000)
+					reset_ts = true;
+				ts *= ST_LSM6DSX_TS_SENSITIVITY;
+
+				offset += ST_LSM6DSX_SAMPLE_SIZE;
+			}
+
+			if (gyro_sip-- > 0)
+				iio_push_to_buffers_with_timestamp(
+					hw->iio_devs[ST_LSM6DSX_ID_GYRO],
+					gyro_buff, gyro_sensor->ts_ref + ts);
+			if (acc_sip-- > 0)
 				iio_push_to_buffers_with_timestamp(
 					hw->iio_devs[ST_LSM6DSX_ID_ACC],
-					iio_buff, acc_ts);
-				offset += ST_LSM6DSX_SAMPLE_SIZE;
-				acc_ts += acc_delta_ts;
-			}
+					acc_buff, acc_sensor->ts_ref + ts);
 		}
 	}
 
+	if (unlikely(reset_ts)) {
+		err = st_lsm6dsx_reset_hw_ts(hw);
+		if (err < 0)
+			return err;
+	}
 	return read_len;
 }
 
···
 		goto out;
 
 	if (hw->enable_mask) {
-		err = st_lsm6dsx_set_fifo_mode(hw, ST_LSM6DSX_FIFO_CONT);
+		/* reset hw ts counter */
+		err = st_lsm6dsx_reset_hw_ts(hw);
 		if (err < 0)
 			goto out;
 
-		/*
-		 * store enable buffer timestamp as reference to compute
-		 * first delta timestamp
-		 */
-		sensor->ts = iio_get_time_ns(iio_dev);
+		err = st_lsm6dsx_set_fifo_mode(hw, ST_LSM6DSX_FIFO_CONT);
 	}
 
 out:
···
 static irqreturn_t st_lsm6dsx_handler_irq(int irq, void *private)
 {
 	struct st_lsm6dsx_hw *hw = private;
-	struct st_lsm6dsx_sensor *sensor;
-	int i;
 
-	if (!hw->sip)
-		return IRQ_NONE;
-
-	for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) {
-		sensor = iio_priv(hw->iio_devs[i]);
-
-		if (sensor->sip > 0) {
-			s64 timestamp;
-
-			timestamp = iio_get_time_ns(hw->iio_devs[i]);
-			sensor->delta_ts = timestamp - sensor->ts;
-			sensor->ts = timestamp;
-		}
-	}
-
-	return IRQ_WAKE_THREAD;
+	return hw->sip > 0 ? IRQ_WAKE_THREAD : IRQ_NONE;
 }
 
 static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c

···
 			},
 			.th_wl = 3, /* 1LSB = 2B */
 		},
+		.ts_settings = {
+			.timer_en = {
+				.addr = 0x58,
+				.mask = BIT(7),
+			},
+			.hr_timer = {
+				.addr = 0x5c,
+				.mask = BIT(4),
+			},
+			.fifo_en = {
+				.addr = 0x07,
+				.mask = BIT(7),
+			},
+			.decimator = {
+				.addr = 0x09,
+				.mask = GENMASK(5, 3),
+			},
+		},
 	},
 	{
 		.wai = 0x69,
···
 				.mask = GENMASK(11, 0),
 			},
 			.th_wl = 3, /* 1LSB = 2B */
+		},
+		.ts_settings = {
+			.timer_en = {
+				.addr = 0x58,
+				.mask = BIT(7),
+			},
+			.hr_timer = {
+				.addr = 0x5c,
+				.mask = BIT(4),
+			},
+			.fifo_en = {
+				.addr = 0x07,
+				.mask = BIT(7),
+			},
+			.decimator = {
+				.addr = 0x09,
+				.mask = GENMASK(5, 3),
+			},
 		},
 	},
 	{
···
 				.mask = GENMASK(11, 0),
 			},
 			.th_wl = 3, /* 1LSB = 2B */
+		},
+		.ts_settings = {
+			.timer_en = {
+				.addr = 0x19,
+				.mask = BIT(5),
+			},
+			.hr_timer = {
+				.addr = 0x5c,
+				.mask = BIT(4),
+			},
+			.fifo_en = {
+				.addr = 0x07,
+				.mask = BIT(7),
+			},
+			.decimator = {
+				.addr = 0x09,
+				.mask = GENMASK(5, 3),
+			},
 		},
 	},
 };
···
 	return err;
 }
 
+static int st_lsm6dsx_init_hw_timer(struct st_lsm6dsx_hw *hw)
+{
+	const struct st_lsm6dsx_hw_ts_settings *ts_settings;
+	int err, val;
+
+	ts_settings = &hw->settings->ts_settings;
+	/* enable hw timestamp generation if necessary */
+	if (ts_settings->timer_en.addr) {
+		val = ST_LSM6DSX_SHIFT_VAL(1, ts_settings->timer_en.mask);
+		err = regmap_update_bits(hw->regmap,
+					 ts_settings->timer_en.addr,
+					 ts_settings->timer_en.mask, val);
+		if (err < 0)
+			return err;
+	}
+
+	/* enable high resolution for hw ts timer if necessary */
+	if (ts_settings->hr_timer.addr) {
+		val = ST_LSM6DSX_SHIFT_VAL(1, ts_settings->hr_timer.mask);
+		err = regmap_update_bits(hw->regmap,
+					 ts_settings->hr_timer.addr,
+					 ts_settings->hr_timer.mask, val);
+		if (err < 0)
+			return err;
+	}
+
+	/* enable ts queueing in FIFO if necessary */
+	if (ts_settings->fifo_en.addr) {
+		val = ST_LSM6DSX_SHIFT_VAL(1, ts_settings->fifo_en.mask);
+		err = regmap_update_bits(hw->regmap,
+					 ts_settings->fifo_en.addr,
+					 ts_settings->fifo_en.mask, val);
+		if (err < 0)
+			return err;
+	}
+	return 0;
+}
+
 static int st_lsm6dsx_init_device(struct st_lsm6dsx_hw *hw)
 {
 	u8 drdy_int_reg;
···
 	if (err < 0)
 		return err;
 
-	return regmap_update_bits(hw->regmap, drdy_int_reg,
-				  ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK,
-				  FIELD_PREP(ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK,
-					     1));
+	err = regmap_update_bits(hw->regmap, drdy_int_reg,
+				 ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK,
+				 FIELD_PREP(ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK,
+					    1));
+	if (err < 0)
+		return err;
+
+	return st_lsm6dsx_init_hw_timer(hw);
 }
 
 static struct iio_dev *st_lsm6dsx_alloc_iiodev(struct st_lsm6dsx_hw *hw,

drivers/iio/light/apds9960.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * apds9960.c - Support for Avago APDS9960 gesture/RGB/ALS/proximity sensor
  *
- * Copyright (C) 2015 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2015, 2018
+ * Author: Matt Ranostay <[e-mail]>
  *
  * TODO: gesture + proximity calib offsets
  */
···
 };
 module_i2c_driver(apds9960_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("ADPS9960 Gesture/RGB/ALS/Proximity sensor");
 MODULE_LICENSE("GPL");

drivers/iio/potentiometer/Kconfig

···
 
 menu "Digital potentiometers"
 
+config AD5272
+	tristate "Analog Devices AD5272 and similar Digital Potentiometer driver"
+	depends on I2C
+	help
+	  Say yes here to build support for the Analog Devices AD5272 and AD5274
+	  digital potentiometer chip.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad5272.
+
 config DS1803
 	tristate "Maxim Integrated DS1803 Digital Potentiometer driver"
 	depends on I2C

drivers/iio/potentiometer/Makefile

···
 #
 
 # When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_AD5272) += ad5272.o
 obj-$(CONFIG_DS1803) += ds1803.o
 obj-$(CONFIG_MAX5481) += max5481.o
 obj-$(CONFIG_MAX5487) += max5487.o

drivers/iio/potentiometer/ad5272.c

···
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Analog Devices AD5272 digital potentiometer driver
+ * Copyright (C) 2018 Phil Reid <[e-mail]>
+ *
+ * Datasheet: http://www.analog.com/media/en/technical-documentation/data-sheets/AD5272_5274.pdf
+ *
+ * DEVID	#Wipers	#Positions	Resistor Opts (kOhm)	i2c address
+ * ad5272	1	1024		20, 50, 100		01011xx
+ * ad5274	1	256		20, 100			01011xx
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+
+#define  AD5272_RDAC_WR  1
+#define  AD5272_RDAC_RD  2
+#define  AD5272_RESET    4
+#define  AD5272_CTL      7
+
+#define  AD5272_RDAC_WR_EN  BIT(1)
+
+struct ad5272_cfg {
+	int max_pos;
+	int kohms;
+	int shift;
+};
+
+enum ad5272_type {
+	AD5272_020,
+	AD5272_050,
+	AD5272_100,
+	AD5274_020,
+	AD5274_100,
+};
+
+static const struct ad5272_cfg ad5272_cfg[] = {
+	[AD5272_020] = { .max_pos = 1024, .kohms = 20 },
+	[AD5272_050] = { .max_pos = 1024, .kohms = 50 },
+	[AD5272_100] = { .max_pos = 1024, .kohms = 100 },
+	[AD5274_020] = { .max_pos = 256,  .kohms = 20,  .shift = 2 },
+	[AD5274_100] = { .max_pos = 256,  .kohms = 100, .shift = 2 },
+};
+
+struct ad5272_data {
+	struct i2c_client       *client;
+	struct mutex            lock;
+	const struct ad5272_cfg *cfg;
+	u8                      buf[2] ____cacheline_aligned;
+};
+
+static const struct iio_chan_spec ad5272_channel = {
+	.type = IIO_RESISTANCE,
+	.output = 1,
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+};
+
+static int ad5272_write(struct ad5272_data *data, int reg, int val)
+{
+	int ret;
+
+	data->buf[0] = (reg << 2) | ((val >> 8) & 0x3);
+	data->buf[1] = (u8)val;
+
+	mutex_lock(&data->lock);
+	ret = i2c_master_send(data->client, data->buf, sizeof(data->buf));
+	mutex_unlock(&data->lock);
+	return ret < 0 ? ret : 0;
+}
+
+static int ad5272_read(struct ad5272_data *data, int reg, int *val)
+{
+	int ret;
+
+	data->buf[0] = reg << 2;
+	data->buf[1] = 0;
+
+	mutex_lock(&data->lock);
+	ret = i2c_master_send(data->client, data->buf, sizeof(data->buf));
+	if (ret < 0)
+		goto error;
+
+	ret = i2c_master_recv(data->client, data->buf, sizeof(data->buf));
+	if (ret < 0)
+		goto error;
+
+	*val = ((data->buf[0] & 0x3) << 8) | data->buf[1];
+	ret = 0;
+error:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int ad5272_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long mask)
+{
+	struct ad5272_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW: {
+		ret = ad5272_read(data, AD5272_RDAC_RD, val);
+		*val = *val >> data->cfg->shift;
+		return ret ? ret : IIO_VAL_INT;
+	}
+	case IIO_CHAN_INFO_SCALE:
+		*val = 1000 * data->cfg->kohms;
+		*val2 = data->cfg->max_pos;
+		return IIO_VAL_FRACTIONAL;
+	}
+
+	return -EINVAL;
+}
+
+static int ad5272_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long mask)
+{
+	struct ad5272_data *data = iio_priv(indio_dev);
+
+	if (mask != IIO_CHAN_INFO_RAW)
+		return -EINVAL;
+
+	if (val >= data->cfg->max_pos || val < 0 || val2)
+		return -EINVAL;
+
+	return ad5272_write(data, AD5272_RDAC_WR, val << data->cfg->shift);
+}
+
+static const struct iio_info ad5272_info = {
+	.read_raw = ad5272_read_raw,
+	.write_raw = ad5272_write_raw,
+};
+
+static int ad5272_reset(struct ad5272_data *data)
+{
+	struct gpio_desc *reset_gpio;
+
+	reset_gpio = devm_gpiod_get_optional(&data->client->dev, "reset",
+		GPIOD_OUT_LOW);
+	if (IS_ERR(reset_gpio))
+		return PTR_ERR(reset_gpio);
+
+	if (reset_gpio) {
+		udelay(1);
+		gpiod_set_value(reset_gpio, 1);
+	} else {
+		ad5272_write(data, AD5272_RESET, 0);
+	}
+	usleep_range(1000, 2000);
+
+	return 0;
+}
+
+static int ad5272_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct iio_dev *indio_dev;
+	struct ad5272_data *data;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, indio_dev);
+
+	data = iio_priv(indio_dev);
+	data->client = client;
+	mutex_init(&data->lock);
+	data->cfg = &ad5272_cfg[id->driver_data];
+
+	ret = ad5272_reset(data);
+	if (ret)
+		return ret;
+
+	ret = ad5272_write(data, AD5272_CTL, AD5272_RDAC_WR_EN);
+	if (ret < 0)
+		return -ENODEV;
+
+	indio_dev->dev.parent = dev;
+	indio_dev->info = &ad5272_info;
+	indio_dev->channels = &ad5272_channel;
+	indio_dev->num_channels = 1;
+	indio_dev->name = client->name;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id ad5272_dt_ids[] = {
+	{ .compatible = "adi,ad5272-020", .data = (void *)AD5272_020 },
+	{ .compatible = "adi,ad5272-050", .data = (void *)AD5272_050 },
+	{ .compatible = "adi,ad5272-100", .data = (void *)AD5272_100 },
+	{ .compatible = "adi,ad5274-020", .data = (void *)AD5274_020 },
+	{ .compatible = "adi,ad5274-100", .data = (void *)AD5274_100 },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ad5272_dt_ids);
+#endif /* CONFIG_OF */
+
+static const struct i2c_device_id ad5272_id[] = {
+	{ "ad5272-020", AD5272_020 },
+	{ "ad5272-050", AD5272_050 },
+	{ "ad5272-100", AD5272_100 },
+	{ "ad5274-020", AD5274_020 },
+	{ "ad5274-100", AD5274_100 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ad5272_id);
+
+static struct i2c_driver ad5272_driver = {
+	.driver = {
+		.name	= "ad5272",
+		.of_match_table = of_match_ptr(ad5272_dt_ids),
+	},
+	.probe		= ad5272_probe,
+	.id_table	= ad5272_id,
+};
+
+module_i2c_driver(ad5272_driver);
+
+MODULE_AUTHOR("Phil Reid <[e-mail]>");
+MODULE_DESCRIPTION("AD5272 digital potentiometer");
+MODULE_LICENSE("GPL v2");

drivers/iio/potentiometer/tpl0102.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * tpl0102.c - Support for Texas Instruments digital potentiometers
  *
- * Copyright (C) 2016 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2016, 2018
+ * Author: Matt Ranostay <[e-mail]>
  *
  * TODO: enable/disable hi-z output control
  */
···
 
 module_i2c_driver(tpl0102_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("TPL0102 digital potentiometer");
 MODULE_LICENSE("GPL");

drivers/iio/potentiostat/lmp91000.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * lmp91000.c - Support for Texas Instruments digital potentiostats
  *
- * Copyright (C) 2016 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2016, 2018
+ * Author: Matt Ranostay <[e-mail]>
  *
  * TODO: bias voltage + polarity control, and multiple chip support
  */
···
 };
 module_i2c_driver(lmp91000_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("LMP91000 digital potentiostat");
 MODULE_LICENSE("GPL");

drivers/iio/pressure/ms5611.h

···
 };
 
 int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
-                 const char* name, int type);
+		 const char *name, int type);
 int ms5611_remove(struct iio_dev *indio_dev);
 
 #endif /* _MS5611_H */

drivers/iio/proximity/as3935.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * as3935.c - Support for AS3935 Franklin lightning sensor
  *
- * Copyright (C) 2014 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
+ * Copyright (C) 2014, 2017-2018
+ * Author: Matt Ranostay <[e-mail]>
  */
 
 #include <linux/module.h>
···
 };
 module_spi_driver(as3935_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("AS3935 lightning sensor");
 MODULE_LICENSE("GPL");

drivers/iio/proximity/pulsedlight-lidar-lite-v2.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * pulsedlight-lidar-lite-v2.c - Support for PulsedLight LIDAR sensor
  *
- * Copyright (C) 2015 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2015, 2017-2018
+ * Author: Matt Ranostay <[e-mail]>
  *
  * TODO: interrupt mode, and signal strength reporting
  */
···
 };
 module_i2c_driver(lidar_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("PulsedLight LIDAR sensor");
 MODULE_LICENSE("GPL");

drivers/iio/temperature/Kconfig

···
 	  This driver can also be built as a module. If so, the module will
 	  be called mlx90614.
 
+config MLX90632
+	tristate "MLX90632 contact-less infrared sensor with medical accuracy"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  If you say yes here you get support for the Melexis
+	  MLX90632 contact-less infrared sensor with medical accuracy
+	  connected with I2C.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called mlx90632.
+
 config TMP006
 	tristate "TMP006 infrared thermopile sensor"
 	depends on I2C

drivers/iio/temperature/Makefile

···
 obj-$(CONFIG_HID_SENSOR_TEMP) += hid-sensor-temperature.o
 obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o
 obj-$(CONFIG_MLX90614) += mlx90614.o
+obj-$(CONFIG_MLX90632) += mlx90632.o
 obj-$(CONFIG_TMP006) += tmp006.o
 obj-$(CONFIG_TMP007) += tmp007.o
 obj-$(CONFIG_TSYS01) += tsys01.o

drivers/iio/temperature/maxim_thermocouple.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * maxim_thermocouple.c  - Support for Maxim thermocouple chips
  *
- * Copyright (C) 2016 Matt Ranostay <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * Copyright (C) 2016-2018 Matt Ranostay
+ * Author: <[e-mail]>
  */
 
 #include <linux/module.h>
···
 };
 module_spi_driver(maxim_thermocouple_driver);
 
-MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
+MODULE_AUTHOR("Matt Ranostay <[e-mail]>");
 MODULE_DESCRIPTION("Maxim thermocouple sensors");
 MODULE_LICENSE("GPL");

drivers/iio/temperature/mlx90632.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
+ *
+ * Copyright (c) 2017 Melexis <[e-mail]>
+ *
+ * Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor
+ */
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/math64.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* Memory sections addresses */
+#define MLX90632_ADDR_RAM	0x4000 /* Start address of ram */
+#define MLX90632_ADDR_EEPROM	0x2480 /* Start address of user eeprom */
+
+/* EEPROM addresses - used at startup */
+#define MLX90632_EE_CTRL	0x24d4 /* Control register initial value */
+#define MLX90632_EE_I2C_ADDR	0x24d5 /* I2C address register initial value */
+#define MLX90632_EE_VERSION	0x240b /* EEPROM version reg address */
+#define MLX90632_EE_P_R		0x240c /* P_R calibration register 32bit */
+#define MLX90632_EE_P_G		0x240e /* P_G calibration register 32bit */
+#define MLX90632_EE_P_T		0x2410 /* P_T calibration register 32bit */
+#define MLX90632_EE_P_O		0x2412 /* P_O calibration register 32bit */
+#define MLX90632_EE_Aa		0x2414 /* Aa calibration register 32bit */
+#define MLX90632_EE_Ab		0x2416 /* Ab calibration register 32bit */
+#define MLX90632_EE_Ba		0x2418 /* Ba calibration register 32bit */
+#define MLX90632_EE_Bb		0x241a /* Bb calibration register 32bit */
+#define MLX90632_EE_Ca		0x241c /* Ca calibration register 32bit */
+#define MLX90632_EE_Cb		0x241e /* Cb calibration register 32bit */
+#define MLX90632_EE_Da		0x2420 /* Da calibration register 32bit */
+#define MLX90632_EE_Db		0x2422 /* Db calibration register 32bit */
+#define MLX90632_EE_Ea		0x2424 /* Ea calibration register 32bit */
+#define MLX90632_EE_Eb		0x2426 /* Eb calibration register 32bit */
+#define MLX90632_EE_Fa		0x2428 /* Fa calibration register 32bit */
+#define MLX90632_EE_Fb		0x242a /* Fb calibration register 32bit */
+#define MLX90632_EE_Ga		0x242c /* Ga calibration register 32bit */
+
+#define MLX90632_EE_Gb		0x242e /* Gb calibration register 16bit */
+#define MLX90632_EE_Ka		0x242f /* Ka calibration register 16bit */
+
+#define MLX90632_EE_Ha		0x2481 /* Ha customer calib value reg 16bit */
+#define MLX90632_EE_Hb		0x2482 /* Hb customer calib value reg 16bit */
+
+/* Register addresses - volatile */
+#define MLX90632_REG_I2C_ADDR	0x3000 /* Chip I2C address register */
+
+/* Control register address - volatile */
+#define MLX90632_REG_CONTROL	0x3001 /* Control Register address */
+#define   MLX90632_CFG_PWR_MASK		GENMASK(2, 1) /* PowerMode Mask */
+/* PowerModes statuses */
+#define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1)
+#define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */
+#define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step*/
+#define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */
+#define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous*/
+
+/* Device status register - volatile */
+#define MLX90632_REG_STATUS	0x3fff /* Device status register */
+#define   MLX90632_STAT_BUSY		BIT(10) /* Device busy indicator */
+#define   MLX90632_STAT_EE_BUSY		BIT(9) /* EEPROM busy indicator */
+#define   MLX90632_STAT_BRST		BIT(8) /* Brown out reset indicator */
+#define   MLX90632_STAT_CYCLE_POS	GENMASK(6, 2) /* Data position */
+#define   MLX90632_STAT_DATA_RDY	BIT(0) /* Data ready indicator */
+
+/* RAM_MEAS address-es for each channel */
+#define MLX90632_RAM_1(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num)
+#define MLX90632_RAM_2(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num + 1)
+#define MLX90632_RAM_3(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num + 2)
+
+/* Magic constants */
+#define MLX90632_ID_MEDICAL	0x0105 /* EEPROM DSPv5 Medical device id */
+#define MLX90632_ID_CONSUMER	0x0205 /* EEPROM DSPv5 Consumer device id */
+#define MLX90632_RESET_CMD	0x0006 /* Reset sensor (address or global) */
+#define MLX90632_REF_12		12LL /**< ResCtrlRef value of Ch 1 or Ch 2 */
+#define MLX90632_REF_3		12LL /**< ResCtrlRef value of Channel 3 */
+#define MLX90632_MAX_MEAS_NUM	31 /**< Maximum measurements in list */
+#define MLX90632_SLEEP_DELAY_MS 3000 /**< Autosleep delay */
+
+struct mlx90632_data {
+	struct i2c_client *client;
+	struct mutex lock; /* Multiple reads for single measurement */
+	struct regmap *regmap;
+	u16 emissivity;
+};
+
+static const struct regmap_range mlx90632_volatile_reg_range[] = {
+	regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
+	regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
+	regmap_reg_range(MLX90632_RAM_1(0),
+			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_volatile_regs_tbl = {
+	.yes_ranges = mlx90632_volatile_reg_range,
+	.n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range),
+};
+
+static const struct regmap_range mlx90632_read_reg_range[] = {
+	regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
+	regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR),
+	regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb),
+	regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
+	regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
+	regmap_reg_range(MLX90632_RAM_1(0),
+			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_readable_regs_tbl = {
+	.yes_ranges = mlx90632_read_reg_range,
+	.n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range),
+};
+
+static const struct regmap_range mlx90632_no_write_reg_range[] = {
+	regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
+	regmap_reg_range(MLX90632_RAM_1(0),
+			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_writeable_regs_tbl = {
+	.no_ranges = mlx90632_no_write_reg_range,
+	.n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range),
+};
+
+static const struct regmap_config mlx90632_regmap = {
+	.reg_bits = 16,
+	.val_bits = 16,
+
+	.volatile_table = &mlx90632_volatile_regs_tbl,
+	.rd_table = &mlx90632_readable_regs_tbl,
+	.wr_table = &mlx90632_writeable_regs_tbl,
+
+	.use_single_rw = true,
+	.reg_format_endian = REGMAP_ENDIAN_BIG,
+	.val_format_endian = REGMAP_ENDIAN_BIG,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static s32 mlx90632_pwr_set_sleep_step(struct regmap *regmap)
+{
+	return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
+				  MLX90632_CFG_PWR_MASK,
+				  MLX90632_PWR_STATUS_SLEEP_STEP);
+}
+
+static s32 mlx90632_pwr_continuous(struct regmap *regmap)
+{
+	return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
+				  MLX90632_CFG_PWR_MASK,
+				  MLX90632_PWR_STATUS_CONTINUOUS);
+}
+
+/**
+ * mlx90632_perform_measurement - Trigger and retrieve current measurement cycle
+ * @*data: pointer to mlx90632_data object containing regmap information
+ *
+ * Perform a measurement and return latest measurement cycle position reported
+ * by sensor. This is a blocking function for 500ms, as that is default sensor
+ * refresh rate.
+ */
+static int mlx90632_perform_measurement(struct mlx90632_data *data)
+{
+	int ret, tries = 100;
+	unsigned int reg_status;
+
+	ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS,
+				 MLX90632_STAT_DATA_RDY, 0);
+	if (ret < 0)
+		return ret;
+
+	while (tries-- > 0) {
+		ret = regmap_read(data->regmap, MLX90632_REG_STATUS,
+				  &reg_status);
+		if (ret < 0)
+			return ret;
+		if (reg_status & MLX90632_STAT_DATA_RDY)
+			break;
+		usleep_range(10000, 11000);
+	}
+
+	if (tries < 0) {
+		dev_err(&data->client->dev, "data not ready");
+		return -ETIMEDOUT;
+	}
+
+	return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2;
+}
+
+static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new,
+				       uint8_t *channel_old)
+{
+	switch (perform_ret) {
+	case 1:
+		*channel_new = 1;
+		*channel_old = 2;
+		break;
+	case 2:
+		*channel_new = 2;
+		*channel_old = 1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int mlx90632_read_ambient_raw(struct regmap *regmap,
+				     s16 *ambient_new_raw, s16 *ambient_old_raw)
+{
+	int ret;
+	unsigned int read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp);
+	if (ret < 0)
+		return ret;
+	*ambient_new_raw = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp);
+	if (ret < 0)
+		return ret;
+	*ambient_old_raw = (s16)read_tmp;
+
+	return ret;
+}
+
+static int mlx90632_read_object_raw(struct regmap *regmap,
+				    int perform_measurement_ret,
+				    s16 *object_new_raw, s16 *object_old_raw)
+{
+	int ret;
+	unsigned int read_tmp;
+	s16 read;
+	u8 channel = 0;
+	u8 channel_old = 0;
+
+	ret = mlx90632_channel_new_select(perform_measurement_ret, &channel,
+					  &channel_old);
+	if (ret != 0)
+		return ret;
+
+	ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp);
+	if (ret < 0)
+		return ret;
+
+	read = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp);
+	if (ret < 0)
+		return ret;
+	*object_new_raw = (read + (s16)read_tmp) / 2;
+
+	ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp);
+	if (ret < 0)
+		return ret;
+	read = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp);
+	if (ret < 0)
+		return ret;
+	*object_old_raw = (read + (s16)read_tmp) / 2;
+
+	return ret;
+}
+
+static int mlx90632_read_all_channel(struct mlx90632_data *data,
+				     s16 *ambient_new_raw, s16 *ambient_old_raw,
+				     s16 *object_new_raw, s16 *object_old_raw)
+{
+	s32 ret, measurement;
+
+	mutex_lock(&data->lock);
+	measurement = mlx90632_perform_measurement(data);
+	if (measurement < 0) {
+		ret = measurement;
+		goto read_unlock;
+	}
+	ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw,
+					ambient_old_raw);
+	if (ret < 0)
+		goto read_unlock;
+
+	ret = mlx90632_read_object_raw(data->regmap, measurement,
+				       object_new_raw, object_old_raw);
+read_unlock:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb,
+				     s32 *reg_value)
+{
+	s32 ret;
+	unsigned int read;
+	u32 value;
+
+	ret = regmap_read(regmap, reg_lsb, &read);
+	if (ret < 0)
+		return ret;
+
+	value = read;
+
+	ret = regmap_read(regmap, reg_lsb + 1, &read);
+	if (ret < 0)
+		return ret;
+
+	*reg_value = (read << 16) | (value & 0xffff);
+
+	return 0;
+}
+
+static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw,
+					s16 ambient_old_raw, s16 Gb)
+{
+	s64 VR_Ta, kGb, tmp;
+
+	kGb = ((s64)Gb * 1000LL) >> 10ULL;
+	VR_Ta = (s64)ambient_old_raw * 1000000LL +
+		kGb * div64_s64(((s64)ambient_new_raw * 1000LL),
+			(MLX90632_REF_3));
+	tmp = div64_s64(
+			 div64_s64(((s64)ambient_new_raw * 1000000000000LL),
+				   (MLX90632_REF_3)), VR_Ta);
+	return div64_s64(tmp << 19ULL, 1000LL);
+}
+
+static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw,
+					s16 ambient_new_raw,
+					s16 ambient_old_raw, s16 Ka)
+{
+	s64 VR_IR, kKa, tmp;
+
+	kKa = ((s64)Ka * 1000LL) >> 10ULL;
+	VR_IR = (s64)ambient_old_raw * 1000000LL +
+		kKa * div64_s64(((s64)ambient_new_raw * 1000LL),
+			(MLX90632_REF_3));
+	tmp = div64_s64(
+			div64_s64(((s64)((object_new_raw + object_old_raw) / 2)
+				   * 1000000000000LL), (MLX90632_REF_12)),
+			VR_IR);
+	return div64_s64((tmp << 19ULL), 1000LL);
+}
+
+static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw,
+				      s32 P_T, s32 P_R, s32 P_G, s32 P_O,
+				      s16 Gb)
+{
+	s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum;
+
+	AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw,
+					   Gb);
+	Asub = ((s64)P_T * 10000000000LL) >> 44ULL;
+	Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL);
+	Ablock = Asub * (Bsub * Bsub);
+	Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL;
+	Cblock = ((s64)P_O * 10000000000LL) >> 8ULL;
+
+	sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock;
+
+	return div64_s64(sum, 10000000LL);
+}
+
+static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
+					       s64 TAdut, s32 Fa, s32 Fb,
+					       s32 Ga, s16 Ha, s16 Hb,
+					       u16 emissivity)
+{
+	s64 calcedKsTO, calcedKsTA, ir_Alpha, TAdut4, Alpha_corr;
+	s64 Ha_customer, Hb_customer;
+
+	Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL;
+	Hb_customer = ((s64)Hb * 100) >> 10ULL;
+
+	calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL)
+			     * 1000LL)) >> 36LL;
+	calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL;
+	Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL)
+				* Ha_customer), 1000LL);
+	Alpha_corr *= ((s64)(1 * 1000000LL + calcedKsTO + calcedKsTA));
+	Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL);
+	Alpha_corr = div64_s64(Alpha_corr, 1000LL);
+	ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr);
+	TAdut4 = (div64_s64(TAdut, 10000LL) + 27315) *
+		(div64_s64(TAdut, 10000LL) + 27315) *
+		(div64_s64(TAdut, 10000LL)  + 27315) *
+		(div64_s64(TAdut, 10000LL) + 27315);
+
+	return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4))
+		- 27315 - Hb_customer) * 10;
+}
+
+static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb,
+				     s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb,
+				     u16 tmp_emi)
+{
+	s64 kTA, kTA0, TAdut;
+	s64 temp = 25000;
+	s8 i;
+
+	kTA = (Ea * 1000LL) >> 16LL;
+	kTA0 = (Eb * 1000LL) >> 8LL;
+	TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL;
+
+	/* Iterations of calculation as described in datasheet */
+	for (i = 0; i < 5; ++i) {
+		temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut,
+							   Fa, Fb, Ga, Ha, Hb,
+							   tmp_emi);
+	}
+	return temp;
+}
+
+static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val)
+{
+	s32 ret;
+	s32 Ea, Eb, Fa, Fb, Ga;
+	unsigned int read_tmp;
+	s16 Ha, Hb, Gb, Ka;
+	s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw;
+	s64 object, ambient;
+
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga);
+	if (ret < 0)
+		return ret;
+	ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Ha = (s16)read_tmp;
+	ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Hb = (s16)read_tmp;
+	ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Gb = (s16)read_tmp;
+	ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Ka = (s16)read_tmp;
+
+	ret = mlx90632_read_all_channel(data,
+					&ambient_new_raw, &ambient_old_raw,
+					&object_new_raw, &object_old_raw);
+	if (ret < 0)
+		return ret;
+
+	ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
+					       ambient_old_raw, Gb);
+	object = mlx90632_preprocess_temp_obj(object_new_raw,
+					      object_old_raw,
+					      ambient_new_raw,
+					      ambient_old_raw, Ka);
+
+	*val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga,
+					 Ha, Hb, data->emissivity);
+	return 0;
+}
+
+static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val)
+{
+	s32 ret;
+	unsigned int read_tmp;
+	s32 PT, PR, PG, PO;
+	s16 Gb;
+	s16 ambient_new_raw, ambient_old_raw;
+
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO);
+	if (ret < 0)
+		return ret;
+	ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Gb = (s16)read_tmp;
+
+	ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw,
+					&ambient_old_raw);
+	*val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw,
+					  PT, PR, PG, PO, Gb);
+	return ret;
+}
+
+static int mlx90632_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *channel, int *val,
+			     int *val2, long mask)
+{
+	struct mlx90632_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (channel->channel2) {
+		case IIO_MOD_TEMP_AMBIENT:
+			ret = mlx90632_calc_ambient_dsp105(data, val);
+			if (ret < 0)
+				return ret;
+			return IIO_VAL_INT;
+		case IIO_MOD_TEMP_OBJECT:
+			ret = mlx90632_calc_object_dsp105(data, val);
+			if (ret < 0)
+				return ret;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_CALIBEMISSIVITY:
+		if (data->emissivity == 1000) {
+			*val = 1;
+			*val2 = 0;
+		} else {
+			*val = 0;
+			*val2 = data->emissivity * 1000;
+		}
+		return IIO_VAL_INT_PLUS_MICRO;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mlx90632_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *channel, int val,
+			      int val2, long mask)
+{
+	struct mlx90632_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_CALIBEMISSIVITY:
+		/* Confirm we are within 0 and 1.0 */
+		if (val < 0 || val2 < 0 || val > 1 ||
+		    (val == 1 && val2 != 0))
+			return -EINVAL;
+		data->emissivity = val * 1000 + val2 / 1000;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_chan_spec mlx90632_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_AMBIENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+	},
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_OBJECT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+			BIT(IIO_CHAN_INFO_CALIBEMISSIVITY),
+	},
+};
+
+static const struct iio_info mlx90632_info = {
+	.read_raw = mlx90632_read_raw,
+	.write_raw = mlx90632_write_raw,
+};
+
+static int mlx90632_sleep(struct mlx90632_data *data)
+{
+	regcache_mark_dirty(data->regmap);
+
+	dev_dbg(&data->client->dev, "Requesting sleep");
+	return mlx90632_pwr_set_sleep_step(data->regmap);
+}
+
+static int mlx90632_wakeup(struct mlx90632_data *data)
+{
+	int ret;
+
+	ret = regcache_sync(data->regmap);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"Failed to sync regmap registers: %d\n", ret);
+		return ret;
+	}
+
+	dev_dbg(&data->client->dev, "Requesting wake-up\n");
+	return mlx90632_pwr_continuous(data->regmap);
+}
+
+static int mlx90632_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	struct iio_dev *indio_dev;
+	struct mlx90632_data *mlx90632;
+	struct regmap *regmap;
+	int ret;
+	unsigned int read;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632));
+	if (!indio_dev) {
+		dev_err(&client->dev, "Failed to allocate device\n");
+		return -ENOMEM;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &mlx90632_regmap);
+	if (IS_ERR(regmap)) {
+		ret = PTR_ERR(regmap);
+		dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret);
+		return ret;
+	}
+
+	mlx90632 = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	mlx90632->client = client;
+	mlx90632->regmap = regmap;
+
+	mutex_init(&mlx90632->lock);
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->name = id->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &mlx90632_info;
+	indio_dev->channels = mlx90632_channels;
+	indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels);
+
+	ret = mlx90632_wakeup(mlx90632);
+	if (ret < 0) {
+		dev_err(&client->dev, "Wakeup failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
+	if (ret < 0) {
+		dev_err(&client->dev, "read of version failed: %d\n", ret);
+		return ret;
+	}
+	if (read == MLX90632_ID_MEDICAL) {
+		dev_dbg(&client->dev,
+			"Detected Medical EEPROM calibration %x\n", read);
+	} else if (read == MLX90632_ID_CONSUMER) {
+		dev_dbg(&client->dev,
+			"Detected Consumer EEPROM calibration %x\n", read);
+	} else {
+		dev_err(&client->dev,
+			"EEPROM version mismatch %x (expected %x or %x)\n",
+			read, MLX90632_ID_CONSUMER, MLX90632_ID_MEDICAL);
+		return -EPROTONOSUPPORT;
+	}
+
+	mlx90632->emissivity = 1000;
+
+	pm_runtime_disable(&client->dev);
+	ret = pm_runtime_set_active(&client->dev);
+	if (ret < 0) {
+		mlx90632_sleep(mlx90632);
+		return ret;
+	}
+	pm_runtime_enable(&client->dev);
+	pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS);
+	pm_runtime_use_autosuspend(&client->dev);
+
+	return iio_device_register(indio_dev);
+}
+
+static int mlx90632_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct mlx90632_data *data = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	pm_runtime_disable(&client->dev);
+	pm_runtime_set_suspended(&client->dev);
+	pm_runtime_put_noidle(&client->dev);
+
+	mlx90632_sleep(data);
+
+	return 0;
+}
+
+static const struct i2c_device_id mlx90632_id[] = {
+	{ "mlx90632", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mlx90632_id);
+
+static const struct of_device_id mlx90632_of_match[] = {
+	{ .compatible = "melexis,mlx90632" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mlx90632_of_match);
+
+static int __maybe_unused mlx90632_pm_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mlx90632_data *data = iio_priv(indio_dev);
+
+	return mlx90632_sleep(data);
+}
+
+static int __maybe_unused mlx90632_pm_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mlx90632_data *data = iio_priv(indio_dev);
+
+	return mlx90632_wakeup(data);
+}
+
+static UNIVERSAL_DEV_PM_OPS(mlx90632_pm_ops, mlx90632_pm_suspend,
+			    mlx90632_pm_resume, NULL);
+
+static struct i2c_driver mlx90632_driver = {
+	.driver = {
+		.name	= "mlx90632",
+		.of_match_table = mlx90632_of_match,
+		.pm	= &mlx90632_pm_ops,
+	},
+	.probe = mlx90632_probe,
+	.remove = mlx90632_remove,
+	.id_table = mlx90632_id,
+};
+module_i2c_driver(mlx90632_driver);
+
+MODULE_AUTHOR("Crt Mori <[e-mail]>");
+MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver");
+MODULE_LICENSE("GPL v2");

drivers/staging/iio/adc/ad7192.c

···
 	if (pdata->unipolar_en)
 		st->conf |= AD7192_CONF_UNIPOLAR;
 
-	if (pdata->burnout_curr_en)
+	if (pdata->burnout_curr_en && pdata->buf_en && !pdata->chop_en) {
 		st->conf |= AD7192_CONF_BURN;
+	} else if (pdata->burnout_curr_en) {
+		dev_warn(&st->sd.spi->dev,
+			 "Can't enable burnout currents: see CHOP or buffer\n");
+	}
 
 	ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
 	if (ret)

drivers/staging/iio/meter/ade7758.h

···
  * @trig:		data ready trigger registered with iio
  * @tx:			transmit buffer
  * @rx:			receive buffer
- * @buf_lock:		mutex to protect tx and rx
+ * @buf_lock:		mutex to protect tx, rx, read and write frequency
  **/
 struct ade7758_state {
 	struct spi_device	*us;

drivers/staging/iio/meter/ade7758_core.c

···
 #include "meter.h"
 #include "ade7758.h"
 
+static int __ade7758_spi_write_reg_8(struct device *dev, u8 reg_address, u8 val)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ade7758_state *st = iio_priv(indio_dev);
+
+	st->tx[0] = ADE7758_WRITE_REG(reg_address);
+	st->tx[1] = val;
+
+	return spi_write(st->us, st->tx, 2);
+}
+
 int ade7758_spi_write_reg_8(struct device *dev, u8 reg_address, u8 val)
 {
 	int ret;
···
 	struct ade7758_state *st = iio_priv(indio_dev);
 
 	mutex_lock(&st->buf_lock);
-	st->tx[0] = ADE7758_WRITE_REG(reg_address);
-	st->tx[1] = val;
-
-	ret = spi_write(st->us, st->tx, 2);
+	ret = __ade7758_spi_write_reg_8(dev, reg_address, val);
 	mutex_unlock(&st->buf_lock);
 
 	return ret;
···
 	return ret;
 }
 
-int ade7758_spi_read_reg_8(struct device *dev, u8 reg_address, u8 *val)
+static int __ade7758_spi_read_reg_8(struct device *dev, u8 reg_address, u8 *val)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ade7758_state *st = iio_priv(indio_dev);
···
 		},
 	};
 
-	mutex_lock(&st->buf_lock);
 	st->tx[0] = ADE7758_READ_REG(reg_address);
 	st->tx[1] = 0;
 
···
 	*val = st->rx[0];
 
 error_ret:
+	return ret;
+}
+
+int ade7758_spi_read_reg_8(struct device *dev, u8 reg_address, u8 *val)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ade7758_state *st = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&st->buf_lock);
+	ret = __ade7758_spi_read_reg_8(dev, reg_address, val);
 	mutex_unlock(&st->buf_lock);
+
 	return ret;
 }
 
···
 {
 	int ret;
 	u8 reg, t;
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ade7758_state *st = iio_priv(indio_dev);
 
 	switch (val) {
 	case 26040:
···
 		t = 3;
 		break;
 	default:
-		ret = -EINVAL;
-		goto out;
+		return -EINVAL;
 	}
 
-	ret = ade7758_spi_read_reg_8(dev, ADE7758_WAVMODE, &reg);
+	mutex_lock(&st->buf_lock);
+
+	ret = __ade7758_spi_read_reg_8(dev, ADE7758_WAVMODE, &reg);
 	if (ret)
 		goto out;
 
 	reg &= ~(5 << 3);
 	reg |= t << 5;
 
-	ret = ade7758_spi_write_reg_8(dev, ADE7758_WAVMODE, reg);
+	ret = __ade7758_spi_write_reg_8(dev, ADE7758_WAVMODE, reg);
 
 out:
+	mutex_unlock(&st->buf_lock);
+
 	return ret;
 }
 
···
 
 	switch (mask) {
 	case IIO_CHAN_INFO_SAMP_FREQ:
-		mutex_lock(&indio_dev->mlock);
+
 		ret = ade7758_read_samp_freq(&indio_dev->dev, val);
-		mutex_unlock(&indio_dev->mlock);
+
 		return ret;
 	default:
 		return -EINVAL;
···
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		if (val2)
 			return -EINVAL;
-		mutex_lock(&indio_dev->mlock);
+
 		ret = ade7758_write_samp_freq(&indio_dev->dev, val);
-		mutex_unlock(&indio_dev->mlock);
+
 		return ret;
 	default:
 		return -EINVAL;

drivers/staging/iio/meter/ade7759.c

···
 };
 
 static int ade7759_spi_write_reg_8(struct device *dev,
-		u8 reg_address,
-		u8 val)
+				   u8 reg_address,
+				   u8 val)
 {
 	int ret;
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
···
 
 /*Unlocked version of ade7759_spi_write_reg_16 function */
 static int __ade7759_spi_write_reg_16(struct device *dev,
-		u8 reg_address,
-		u16 value)
+				      u8 reg_address,
+				      u16 value)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ade7759_state *st = iio_priv(indio_dev);
···
 }
 
 static int ade7759_spi_write_reg_16(struct device *dev,
-		u8 reg_address,
-		u16 value)
+				    u8 reg_address,
+				    u16 value)
 {
 	int ret;
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
···
 }
 
 static int ade7759_spi_read_reg_8(struct device *dev,
-		u8 reg_address,
-		u8 *val)
+				  u8 reg_address,
+				  u8 *val)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ade7759_state *st = iio_priv(indio_dev);
···
 
 	ret = spi_w8r8(st->us, ADE7759_READ_REG(reg_address));
 	if (ret < 0) {
-		dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",
-				reg_address);
+		dev_err(&st->us->dev,
+			"problem when reading 8 bit register 0x%02X",
+			reg_address);
 		return ret;
 	}
 	*val = ret;
···
 }
 
 static int ade7759_spi_read_reg_16(struct device *dev,
-		u8 reg_address,
-		u16 *val)
+				   u8 reg_address,
+				   u16 *val)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ade7759_state *st = iio_priv(indio_dev);
···
 }
 
 static int ade7759_spi_read_reg_40(struct device *dev,
-		u8 reg_address,
-		u64 *val)
+				   u8 reg_address,
+				   u64 *val)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ade7759_state *st = iio_priv(indio_dev);
···
 
 	ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));
 	if (ret) {
-		dev_err(&st->us->dev, "problem when reading 40 bit register 0x%02X",
-				reg_address);
+		dev_err(&st->us->dev,
+			"problem when reading 40 bit register 0x%02X",
+			reg_address);
 		goto error_ret;
 	}
 	*val = ((u64)st->rx[1] << 32) | ((u64)st->rx[2] << 24) |
···
 }
 
 static ssize_t ade7759_read_8bit(struct device *dev,
-		struct device_attribute *attr,
-		char *buf)
+				 struct device_attribute *attr,
+				 char *buf)
 {
 	int ret;
 	u8 val = 0;
···
 }
 
 static ssize_t ade7759_read_16bit(struct device *dev,
-		struct device_attribute *attr,
-		char *buf)
+				  struct device_attribute *attr,
+				  char *buf)
 {
 	int ret;
 	u16 val = 0;
···
 }
 
 static ssize_t ade7759_read_40bit(struct device *dev,
-		struct device_attribute *attr,
-		char *buf)
+				  struct device_attribute *attr,
+				  char *buf)
 {
 	int ret;
 	u64 val = 0;
···
 }
 
 static ssize_t ade7759_write_8bit(struct device *dev,
-		struct device_attribute *attr,
-		const char *buf,
-		size_t len)
+				  struct device_attribute *attr,
+				  const char *buf,
+				  size_t len)
 {
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 	int ret;
···
 }
 
 static ssize_t ade7759_write_16bit(struct device *dev,
-		struct device_attribute *attr,
-		const char *buf,
-		size_t len)
+				   struct device_attribute *attr,
+				   const char *buf,
+				   size_t len)
 {
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 	int ret;
···
 	int ret;
 	u16 val;
 
-	ret = ade7759_spi_read_reg_16(dev,
-			ADE7759_MODE,
-			&val);
+	ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, &val);
 	if (ret < 0)
 		return ret;
 
···
 	int ret;
 	u16 val;
 
-	ret = ade7759_spi_read_reg_16(dev,
-			ADE7759_MODE,
-			&val);
+	ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, &val);
 	if (ret < 0) {
 		dev_err(dev, "unable to power down the device, error: %d\n",
 			ret);
···
 }
 
 static ssize_t ade7759_read_frequency(struct device *dev,
-		struct device_attribute *attr,
-		char *buf)
+				      struct device_attribute *attr,
+				      char *buf)
 {
 	int ret;
 	u16 t;
 	int sps;
 
-	ret = ade7759_spi_read_reg_16(dev,
-			ADE7759_MODE,
-			&t);
+	ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, &t);
 	if (ret)
 		return ret;
 
···
 }
 
 static ssize_t ade7759_write_frequency(struct device *dev,
-		struct device_attribute *attr,
-		const char *buf,
-		size_t len)
+				       struct device_attribute *attr,
+				       const char *buf,
+				       size_t len)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ade7759_state *st = iio_priv(indio_dev);

include/linux/kernel.h

···
 
 unsigned long int_sqrt(unsigned long);
 
+#if BITS_PER_LONG < 64
+u32 int_sqrt64(u64 x);
+#else
+static inline u32 int_sqrt64(u64 x)
+{
+	return (u32)int_sqrt(x);
+}
+#endif
+
 extern void bust_spinlocks(int yes);
 extern int oops_in_progress;		/* If set, an oops, panic(), BUG() or die() is in progress */
 extern int panic_timeout;

include/linux/mfd/axp20x.h

···
 #define AXP288_RT_BATT_V_H		0xa0
 #define AXP288_RT_BATT_V_L		0xa1
 
+#define AXP813_ADC_RATE			0x85
+
 /* Fuel Gauge */
 #define AXP288_FG_RDC1_REG          0xba
 #define AXP288_FG_RDC0_REG          0xbb

lib/int_sqrt.c

···
 	return y;
 }
 EXPORT_SYMBOL(int_sqrt);
+
+#if BITS_PER_LONG < 64
+/**
+ * int_sqrt64 - strongly typed int_sqrt function when minimum 64 bit input
+ * is expected.
+ * @x: 64bit integer of which to calculate the sqrt
+ */
+u32 int_sqrt64(u64 x)
+{
+	u64 b, m, y = 0;
+
+	if (x <= ULONG_MAX)
+		return int_sqrt((unsigned long) x);
+
+	m = 1ULL << (fls64(x) & ~1ULL);
+	while (m != 0) {
+		b = y + m;
+		y >>= 1;
+
+		if (x >= b) {
+			x -= b;
+			y += m;
+		}
+		m >>= 2;
+	}
+
+	return y;
+}
+EXPORT_SYMBOL(int_sqrt64);
+#endif